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Back of the Box Builds

LEGO Alternate Builds!

  • SETS
    • Adventurers
    • Aquazone
    • Belville
    • Building Set with People
    • Castle
    • Duplo
    • Fabuland
    • Harry Potter
    • Holiday and Event
    • LEGOLAND
    • Model Team
    • Pirates
    • Space
    • Star Wars
    • Technic
    • Town
    • Universal Building Set
    • Western
    • More Sets
    • Misc
  • USEFUL LINKS
    • Submit Instructions!
    • New Instructions
    • New Official Sets
    • New Alternate Builds
    • Minifigs
    • Very Small Builds
    • Small Builds
    • Medium Builds
    • Large Builds
    • Extra Large Builds
    • How BOTBB was Built
  • THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Unitron

Alternate Builds Instructions Added Large Alt Build Large Builds Space Unitron Unitron Alternate Builds 

1793 – Back C

August 31, 2024September 6, 2024 Master Builder 2715 Views

From: 1793: Space Station ZenonName: Zenon Laboratory Instructions: View PDF | Download .io File

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Alternate Builds Instructions Added Large Alt Build Large Builds Space Unitron Unitron Alternate Builds 

1793 – Back B

July 30, 2024August 8, 2024 Master Builder 2173 Views

From: 1793: Space Station ZenonName: Zenon CPU Factory Instructions: View PDF | Download .io File

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Alternate Builds Instructions Added Large Alt Build Large Builds Space Unitron Unitron Alternate Builds 

1793 – Back A

June 30, 2024September 6, 2024 Master Builder 2703 Views

From: 1793: Space Station ZenonName: Unitron Summer House Instructions: View PDF | Download .io File

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Alternate Builds Instructions Added Medium Alt Build Medium Builds Space Unitron Unitron Alternate Builds 

1789 – Back A

January 16, 2024January 17, 2024 Master Builder 3658 Views

From: 1789: Star Hawk IIName: Star Spinner Instructions: View PDF

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Alternate Builds Instructions Added Medium Alt Build Medium Builds Space Unitron Unitron Alternate Builds 

1787 – Back C

October 5, 2023October 10, 2023 Master Builder 1873 Views

From: 1787: Crater CruiserName: Crater Twins Instructions: View PDF | Download .io File

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Alternate Builds Instructions Added Medium Alt Build Medium Builds Space Unitron Unitron Alternate Builds 

1787 – Back B

September 14, 2023September 18, 2023 Master Builder 2390 Views

From: 1787: Crater CruiserName: Crater DJ Outpost Instructions: View PDF | Download .io File

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ABCs Commercials Instructions Added Space Spyrius Unitron Unitron Alternate Builds 

1994 Unitron and Spyrius Commercial

August 16, 2023August 18, 2023 Master Builder 4016 Views

MiscFeatured: 6991: Monorail Transport Base, 6939: Saucer Centurion, 6949: Robo-Guardian, 6889: Recon Robot Build: Unitron Alarm Tower Instructions: View PDF

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Alternate Builds Instructions Added Medium Alt Build Medium Builds Space Unitron Unitron Alternate Builds 

1787 – Back A

June 28, 2023June 30, 2023 Master Builder 3461 Views

From: 1787: Crater CruiserName: Asymmetrical Rover Instructions: View PDF | Download .io File

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Alternate Builds Instructions Added Small Alt Build Small Builds Space Spyrius Spyrius Alternate Builds Unitron Unitron Alternate Builds 

1785 – Back C

April 8, 2022May 10, 2022 Master Builder 2805 Views

From: 1785: Introducing Crater CrittersName: Looky Instructions: View PDF | Download .io File

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Alternate Builds Instructions Added Small Alt Build Small Builds Space Spyrius Spyrius Alternate Builds Unitron Unitron Alternate Builds 

1785 – Back B

April 8, 2022May 10, 2022 Master Builder 3057 Views

From: 1785: Introducing Crater CrittersName: Grabby Instructions: View PDF | Download .io File

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Alternate Builds Instructions Added Small Alt Build Small Builds Space Spyrius Spyrius Alternate Builds Unitron Unitron Alternate Builds 

1785 – Back A

April 8, 2022May 10, 2022 Master Builder 3019 Views

From: 1785: Introducing Crater CrittersName: Tasty Instructions: View PDF | Download .io File

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Official Sets Small Builds Space Spyrius Spyrius Sets Unitron Unitron Sets 

1785: Introducing Crater Critters

December 28, 2021December 28, 2021 Master Builder 4364 Views

Year Released: 1995BricklinkInstructions

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Large Builds Official Sets Space Unitron Unitron Sets 

1793: Space Station Zenon

April 19, 2021April 19, 2021 Master Builder 5469 Views

Year Released: 1995Bricklink

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Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1789 – Back C

July 18, 2020July 18, 2020 Master Builder 2432 Views

From: 1789: Star Hawk IIName: TBDSubmitted by: USERInstructions

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Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1789 – Back B

July 18, 2020July 18, 2020 Master Builder 2026 Views

From: 1789: Star Hawk IIName: TBDSubmitted by: USERInstructions

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Medium Builds Official Sets Space Unitron Unitron Sets 

1789: Star Hawk II

July 18, 2020July 18, 2020 Master Builder 5704 Views

Year Released: 1995InstructionsBricklink

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Medium Builds Official Sets Space Unitron Unitron Sets 

1787: Crater Cruiser

April 9, 2020July 18, 2020 Master Builder 5026 Views

Year Released: 1995InstructionsBricklink

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Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back D

September 28, 2019September 28, 2019 Master Builder 2217 Views

From: 6991: Monorail Transport BaseName: TBDSubmitted by: USERInstructions

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Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back C

September 28, 2019September 28, 2019 Master Builder 2221 Views

From: 6991: Monorail Transport BaseName: TBDSubmitted by: USERInstructions

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Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back B

September 28, 2019September 28, 2019 Master Builder 2702 Views

From: 6991: Monorail Transport BaseName: TBDSubmitted by: USERInstructions

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Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back A

September 28, 2019September 28, 2019 Master Builder 2653 Views

From: 6991: Monorail Transport BaseName: TBDSubmitted by: USERInstructions

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Extra Large Builds Jørn Thomsen Official Sets Space Unitron Unitron Sets 

6991: Monorail Transport Base

September 28, 2019July 29, 2023 Master Builder 6500 Views

Year Released: 1994Designer: Jørn ThomsenBricklinkInstructions

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EXPLORE MORE OFFICIAL SETS

6780: XT-Starship
ABCs Classic Space Classic Space Sets Medium Builds Official Sets Space 

6780: XT-Starship

October 12, 2021September 9, 2024 Master Builder

Year Released: 1986BricklinkInstructions *Alternate Build Connection: 1988 Classic Space and Blacktron with Zack Commercial

7310: Mono Jet
Life on Mars Life on Mars Sets Official Sets Very Small Builds 

7310: Mono Jet

April 16, 2021April 16, 2021 Master Builder
1704: {Unknown – Ice Planet Satellite Plow ?}
Bonus/Value Pack Sets Classic Town Fire Ice Planet 2002 Ice Planet 2002 Sets Official Sets Small Builds Space Town 

1704: {Unknown – Ice Planet Satellite Plow ?}

September 6, 2023September 7, 2023 Master Builder
4719: Quality Quidditch Supplies
Chamber of Secrets Harry Potter Harry Potter Sets Medium Builds Official Sets 

4719: Quality Quidditch Supplies

March 22, 2025March 22, 2025 Master Builder
6078: Royal Drawbridge
Castle Castle Sets Daniel August Krentz Large Builds Official Sets Royal Knights 

6078: Royal Drawbridge

January 12, 2022July 29, 2023 Master Builder
6067: Guarded Inn
Castle Castle Sets Daniel August Krentz Large Builds Lion Knights Official Sets 

6067: Guarded Inn

February 9, 2021July 29, 2023 Master Builder
6199: Hydro Crystalization Station
ABCs Aquazone Aquazone Sets Box Story Extra Large Builds Hydronauts Official Sets Stingrays 

6199: Hydro Crystalization Station

February 18, 2025February 18, 2025 Master Builder
2551: Grandma’s Kitchen
Duplo Duplo Sets Official Sets Playhouse Small Builds 

2551: Grandma’s Kitchen

February 27, 2023February 27, 2023 Master Builder
6750: Sonic Robot
Classic Space Classic Space Sets Official Sets Small Builds 

6750: Sonic Robot

September 22, 2019September 28, 2019 Master Builder
6155: Deep Sea Predator
Aquashark Aquazone Aquazone Sets Official Sets Small Builds 

6155: Deep Sea Predator

May 10, 2022May 10, 2022 Master Builder
6842: Shuttle Craft
Classic Space Classic Space Sets Official Sets Small Builds 

6842: Shuttle Craft

October 21, 2019October 21, 2019 Master Builder
4500: Rebel Snowspeeder
Episode II Episode IV/V/VI Medium Builds Official Sets Star Wars Star Wars Sets 

4500: Rebel Snowspeeder

April 9, 2020April 9, 2020 Master Builder
6037: Witch’s Windship
Castle Castle Sets Fright Knights Official Sets Small Builds 

6037: Witch’s Windship

December 29, 2021December 29, 2021 Master Builder
6495: Time Tunnelator
Official Sets Small Builds Time Cruisers Time Cruisers Sets 

6495: Time Tunnelator

July 14, 2021July 14, 2021 Master Builder
6706: Frontier Patrol
Cowboys Official Sets Very Small Builds Western Western Sets 

6706: Frontier Patrol

October 10, 2023October 10, 2023 Master Builder
6075-1: Wolfpack Tower
Castle Castle Sets Duplicate Set Number Large Builds Official Sets Wolfpack 

6075-1: Wolfpack Tower

October 11, 2021March 11, 2024 Master Builder

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MINIFIGS

About This Site

Logo
There were once pictures of additional LEGO® builds on the back of set boxes. Written on the boxes was typically something about the endless building possibilities, "Build any of these exciting models with this set!" There were no instructions for these alternate builds, until now.

Sets

  • Adventurers
  • Aquazone
  • Belville
  • Building Set with People
  • Castle
  • Duplo
  • Fabuland
  • Harry Potter
  • Holiday and Event
  • LEGOLAND
  • Model Team
  • Pirates
  • Space
  • Star Wars
  • Technic
  • Town
  • Universal Building Set
  • Western
  • More Sets
  • Misc

Useful Links

  • Submit Instructions!
  • New Instructions
  • New Official Sets
  • New Alternate Builds
  • Minifigs
  • Very Small Builds (<35 pcs)
  • Small Builds (<100 pcs)
  • Medium Builds (<200 pcs)
  • Large Builds (<400 pcs)
  • Extra Large Builds (>400 pcs)
  • How BOTBB was Built

In Honor of 1526

The classic space set that never was.

Copyright © 2025 Back of the Box Builds. All rights reserved. LEGO® is a trademark of the LEGO Group of companies which does not sponsor, authorize, or endorse this site.