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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 2710 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 2168 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 2695 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 3649 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 1869 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 2382 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 4004 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 3454 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 2800 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 3056 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 3014 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 4358 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 5457 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 2427 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 2022 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 5693 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 5017 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 2210 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 2215 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 2696 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 2644 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 6489 Views

Year Released: 1994Designer: Jørn ThomsenBricklinkInstructions

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EXPLORE MORE OFFICIAL SETS

6972: Polaris I Space Lab
Classic Space Classic Space Sets Large Builds Official Sets 

6972: Polaris I Space Lab

September 12, 2019November 21, 2023 Master Builder

Year Released: 1987BricklinkInstructions *Alternate Build Connection: 1988 Classic Space and Blacktron with Zack Commercial

6349: Vacation House
Building Classic Town Medium Builds Official Sets Town Town Sets 

6349: Vacation House

July 1, 2021July 12, 2021 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
4910: Hover Scout
Official Sets Rock Raiders Rock Raiders Sets Very Small Builds 

4910: Hover Scout

March 1, 2023March 1, 2023 Master Builder
6980: Galaxy Commander
Classic Space Classic Space Sets Extra Large Builds Official Sets Space 

6980: Galaxy Commander

July 21, 2021July 21, 2021 Master Builder
6289: Red Beard Runner
Extra Large Builds Official Sets Pirates Pirates I Pirates Sets 

6289: Red Beard Runner

July 13, 2021July 13, 2021 Master Builder
6679: Dark Shark
Classic Town Harbor Official Sets Small Builds Town Town Sets Wrecker 

6679: Dark Shark

December 28, 2021December 28, 2021 Master Builder
6516: Moon Walker
Launch Command Official Sets Recreation Town Town Sets Very Small Builds 

6516: Moon Walker

April 9, 2020April 9, 2020 Master Builder
6334: Wave Jump Racers
Classic Town Medium Builds Official Sets Race Town Town Sets 

6334: Wave Jump Racers

June 27, 2022June 27, 2022 Master Builder
6681: Police Van
Classic Town Official Sets Police Small Builds Town Town Sets 

6681: Police Van

October 13, 2021October 13, 2021 Master Builder
2152: Robo Raptor
ABCs Large Builds Official Sets Robo Force Robo Force Sets Space 

2152: Robo Raptor

January 14, 2021March 22, 2025 Master Builder
6557: Treasure Hunters
Divers Medium Builds Official Sets Town Town Sets 

6557: Treasure Hunters

December 29, 2021June 28, 2022 Master Builder
6925: Interplanetary Rover
Bjarne Tveskov Futron Sets Futuron Medium Builds Official Sets 

6925: Interplanetary Rover

September 25, 2019July 29, 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
6641: 4-Wheelin’ Truck (Four Wheelin’ Truck)
Classic Town Off-Road Official Sets Small Builds Town Town Sets 

6641: 4-Wheelin’ Truck (Four Wheelin’ Truck)

May 7, 2022May 7, 2022 Master Builder
6939: Saucer Centurion
ABCs Jørn Thomsen Medium Builds Official Sets Spyrius Spyrius Sets 

6939: Saucer Centurion

November 9, 2019October 1, 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.