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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 2700 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 2164 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 2684 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 3636 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 1857 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 2375 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 3992 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 3445 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 2793 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 3048 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 3008 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 4342 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 5446 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 2422 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 2018 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 5680 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 5003 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 2201 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 2208 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 2690 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 2634 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 6472 Views

Year Released: 1994Designer: Jørn ThomsenBricklinkInstructions

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EXPLORE MORE OFFICIAL SETS

6872: Xenon X-Craft
Classic Space Classic Space Sets Official Sets Small Builds 

6872: Xenon X-Craft

October 19, 2019October 19, 2019 Master Builder

Year Released: 1985Bricklink

1499: Twin Starfire
Classic Space Classic Space Sets Official Sets Small Builds Space 

1499: Twin Starfire

February 3, 2021February 3, 2021 Master Builder
6828: Twin-Winged Spoiler
Futron Sets Futuron Official Sets Small Builds Space 

6828: Twin-Winged Spoiler

November 20, 2019May 25, 2020 Master Builder
4032: Passenger Plane
Airport Medium Builds Official Sets Town Town Sets World City 

4032: Passenger Plane

December 29, 2021December 29, 2021 Master Builder
6198: Stingray Stormer
Aquazone Aquazone Sets Large Builds Official Sets Stingrays 

6198: Stingray Stormer

October 29, 2019April 4, 2020 Master Builder
6370: Weekend Home
Building Classic Town Medium Builds Official Sets Town Town Sets 

6370: Weekend Home

February 17, 2023February 19, 2023 Master Builder
6952: Solar Power Transporter
ABCs Classic Space Classic Space Sets Large Builds Official Sets 

6952: Solar Power Transporter

September 22, 2019March 20, 2025 Master Builder
4563: Load N’ Haul Railroad
9V Extra Large Builds Official Sets Town Train Train Sets 

4563: Load N’ Haul Railroad

July 26, 2022July 26, 2022 Master Builder
6076: Dark Dragon’s Den
Castle Castle Sets Dragon Knights Medium Builds Official Sets 

6076: Dark Dragon’s Den

December 27, 2021December 27, 2021 Master Builder
6099: Traitor Transport {with Dragon Cave}
Box Plus Castle Castle Sets Fright Knights Medium Builds Official Sets Playscape/Play Stage Box 

6099: Traitor Transport {with Dragon Cave}

April 1, 2025April 1, 2025 Master Builder
6444: Outback Airstrip
Classic Town Medium Builds Official Sets Outback Town Town Sets 

6444: Outback Airstrip

November 21, 2023November 21, 2023 Master Builder
1526: Unknown (Space Radar Buggy)
Classic Space Classic Space Sets Official Sets Small Builds Space 

1526: Unknown (Space Radar Buggy)

April 4, 2020March 14, 2025 Master Builder
5948: Desert Expedition
Adventurers Adventurers Sets Desert Medium Builds Official Sets 

5948: Desert Expedition

October 8, 2024October 8, 2024 Master Builder
6977: Arachnoid Star Base
Insectoids Insectoids Sets Large Builds Official Sets 

6977: Arachnoid Star Base

November 9, 2019November 9, 2019 Master Builder
6205: V-wing Fighter
Episode III Medium Builds Official Sets Star Wars Star Wars Sets 

6205: V-wing Fighter

March 3, 2023March 3, 2023 Master Builder
6396: International Jetport
Airport Classic Town Extra Large Builds Official Sets Town Town Sets 

6396: International Jetport

July 14, 2021July 14, 2021 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.