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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

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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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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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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EXPLORE MORE OFFICIAL SETS

6358: Snorkel Squad
Classic Town Fire Medium Builds Official Sets Town Town Sets 

6358: Snorkel Squad

April 15, 2021April 15, 2021 Master Builder

Year Released: 1987BricklinkInstructions

6509: Red Devil Racer
Classic Town Official Sets Small Builds Town Town Sets Traffic 

6509: Red Devil Racer

October 12, 2021October 12, 2021 Master Builder
7119: Twin-Pod Cloud Car
Episode IV/V/VI Official Sets Small Builds Star Wars Star Wars Sets 

7119: Twin-Pod Cloud Car

February 26, 2023February 26, 2023 Master Builder
6928: Uranium Search Vehicle
Classic Space Classic Space Sets Medium Builds Official Sets Space 

6928: Uranium Search Vehicle

January 12, 2021October 21, 2024 Master Builder
775: Fire Fighter Ship
Boat Fire Medium Builds Official Sets 

775: Fire Fighter Ship

July 22, 2024July 22, 2024 Master Builder
4501: Mos Eisley Cantina
Episode IV/V/VI Medium Builds Official Sets Star Wars Star Wars Sets 

4501: Mos Eisley Cantina

December 29, 2021December 29, 2021 Master Builder
6356: Med-Star Rescue Plane
Classic Town Hospital Medium Builds Official Sets Town Town Sets 

6356: Med-Star Rescue Plane

March 16, 2022March 16, 2022 Master Builder
6388: Holiday Home with Caravan
Building Classic Town Large Builds Official Sets Town Town Sets 

6388: Holiday Home with Caravan

July 1, 2022July 1, 2022 Master Builder
6803: Space Patrol
Classic Space Classic Space Sets Official Sets Very Small Builds 

6803: Space Patrol

September 21, 2019October 19, 2019 Master Builder
6847: Space Dozer
ABCs Classic Space Classic Space Sets Official Sets Small Builds Space 

6847: Space Dozer

January 29, 2025April 10, 2025 Master Builder
6276: Eldorado Fortress
Box Story Daniel August Krentz Extra Large Builds Imperial Soldiers Niels Milan Pedersen Official Sets Pirates Pirates I Pirates Sets 

6276: Eldorado Fortress

January 28, 2022April 3, 2024 Master Builder
8002: Destroyer Droid
Episode I Extra Large Builds Official Sets Star Wars Star Wars Sets Star Wars Technic Technic 

8002: Destroyer Droid

August 17, 2023September 1, 2023 Master Builder
1509: Town Value Pack
Bonus/Value Pack Sets Bonus/Value Packs Official Sets Race Small Builds Town 

1509: Town Value Pack

October 8, 2024October 8, 2024 Master Builder
607: Mini Loader
Classic Town Construction Official Sets Town Town Sets Very Small Builds 

607: Mini Loader

October 19, 2019April 4, 2020 Master Builder
5810: Vanity Fun
Belville Belville Sets Lion Knights Official Sets Playhouse Very Small Builds 

5810: Vanity Fun

April 10, 2021April 10, 2021 Master Builder
5581: Magic Flash
Extra Large Builds Model Team Model Team Sets Official Sets 

5581: Magic Flash

January 2, 2024January 2, 2024 Master Builder

BOXES

INSTRUCTIONS

FAVORITES

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.