Skip to content
Back of the Box Builds

Back of the Box Builds

LEGO Set Alternate Builds!

  • THEMES
    • Adventurers
    • Aquazone
    • Belville
    • Building Set with People
    • Castle
    • Duplo
    • Harry Potter
    • Holiday and Event
    • Model Team
    • Ninja
    • Pirates
    • Rock Raiders
    • Space
    • Star Wars
    • Studios
    • Technic
    • Time Cruisers
    • Town
    • Train
    • Western
    • Misc
  • USEFUL LINKS
    • Contribute!
    • New Instructions
    • New Official Sets
    • New Alternate Builds
    • Minifigs
    • Very Small Builds
    • Small Builds
    • Medium Builds
    • Large Builds
    • Extra Large Builds
    • About
  • THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Unitron Alternate Builds

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 1469 Views

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

Read more
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 1480 Views

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

Read more
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 1477 Views

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

Read more
Alternate Builds Large Builds Space Unitron Unitron Alternate Builds 

1793 – Back C

April 19, 2021April 19, 2021 Master Builder 1233 Views

From: 1793: Space Station ZenonName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Large Builds Space Unitron Unitron Alternate Builds 

1793 – Back B

April 19, 2021April 19, 2021 Master Builder 962 Views

From: 1793: Space Station ZenonName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Large Builds Space Unitron Unitron Alternate Builds 

1793 – Back A

April 19, 2021April 19, 2021 Master Builder 1210 Views

From: 1793: Space Station ZenonName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1789 – Back C

July 18, 2020July 18, 2020 Master Builder 1238 Views

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

Read more
Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1789 – Back B

July 18, 2020July 18, 2020 Master Builder 834 Views

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

Read more
Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1789 – Back A

July 18, 2020July 18, 2020 Master Builder 1370 Views

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

Read more
Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1787 – Back C

April 9, 2020 Master Builder 710 Views

From: 1787: Crater CruiserName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1787 – Back B

April 9, 2020April 9, 2020 Master Builder 923 Views

From: 1787: Crater CruiserName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Medium Builds Space Unitron Unitron Alternate Builds 

1787 – Back A

April 9, 2020April 9, 2020 Master Builder 1560 Views

From: 1787: Crater CruiserName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back D

September 28, 2019September 28, 2019 Master Builder 814 Views

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

Read more
Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back C

September 28, 2019September 28, 2019 Master Builder 824 Views

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

Read more
Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back B

September 28, 2019September 28, 2019 Master Builder 1057 Views

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

Read more
Alternate Builds Extra Large Builds Unitron Unitron Alternate Builds 

6991 – Back A

September 28, 2019September 28, 2019 Master Builder 874 Views

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

Read more

EXPLORE MORE OFFICIAL SETS

6077-2: Forestmen’s River Fortress
Castle Castle Sets Forestmen Large Builds Official Sets 

6077-2: Forestmen’s River Fortress

April 19, 2021February 2, 2022 Master Builder

Year Released: 1989BricklinkInstructions

7128: Speeder Bikes
Episode IV/V/VI Official Sets Small Builds Star Wars Star Wars Sets 

7128: Speeder Bikes

July 14, 2021July 14, 2021 Master Builder
6373: Motorcycle Shop
Classic Town Medium Builds Official Sets Town Town Sets Traffic 

6373: Motorcycle Shop

January 6, 2022January 6, 2022 Master Builder
1843 – Bottom
Castle Castle Alternate Builds Instructions Added Official Sets Royal Knights Small Alt Build Small Builds Space Spyrius Spyrius Sets Value Packs 

1843 – Bottom

January 22, 2021October 25, 2021 Master Builder
4582: Red Bullet
Official Sets Very Small Builds 

4582: Red Bullet

October 23, 2021October 23, 2021 Master Builder
1593: Super Model
Classic Space Classic Space Sets Large Builds Official Sets Space 

1593: Super Model

February 3, 2021February 3, 2021 Master Builder
6919: Planetary Prowler
Insectoids Insectoids Sets Large Builds Official Sets 

6919: Planetary Prowler

November 9, 2019November 9, 2019 Master Builder
1749: Paravane
Aquanauts Aquazone Aquazone Sets Official Sets Very Small Builds 

1749: Paravane

July 26, 2020July 26, 2020 Master Builder
1787: Crater Cruiser
Medium Builds Official Sets Space Unitron Unitron Sets 

1787: Crater Cruiser

April 9, 2020July 18, 2020 Master Builder
6824: Space Dart I
Classic Space Classic Space Sets Official Sets Very Small Builds 

6824: Space Dart I

September 30, 2019October 6, 2019 Master Builder
3439: Spy Runner
Airport Classic Town Medium Builds Official Sets Town Town Sets 

3439: Spy Runner

May 11, 2022May 11, 2022 Master Builder
6482: Rescue Helicopter
Classic Town Hospital Medium Builds Official Sets Town Town Sets 

6482: Rescue Helicopter

April 9, 2020February 3, 2021 Master Builder
6453: Com-Link Cruiser (Comlink Cruiser)
Official Sets Small Builds Space Port Town Town Sets 

6453: Com-Link Cruiser (Comlink Cruiser)

August 2, 2020July 14, 2021 Master Builder
6931: FX-Star Patroller
Classic Space Classic Space Sets Medium Builds Official Sets Space 

6931: FX-Star Patroller

January 12, 2021January 12, 2021 Master Builder
6341: Gas N’ Go Flyer
Airport Classic Town Official Sets Small Builds Town Town Sets 

6341: Gas N’ Go Flyer

December 27, 2021December 27, 2021 Master Builder
894: Mobile Ground Tracking Station
Classic Space Classic Space Sets Official Sets Small Builds Space 

894: Mobile Ground Tracking Station

January 12, 2021January 12, 2021 Master Builder

MINIFIGS

About This Site

Logo
In the 1960s, 70s, 80s, 90s, and early 2000s there were pictures of additional builds on the back of LEGO® boxes. There was a note that said you could build any of those exciting models with that set. There were no instructions, until now.

Themes

  • Adventurers
  • Aquazone
  • Belville
  • Building Set with People
  • Castle
  • Duplo
  • Harry Potter
  • Holiday and Event
  • Model Team
  • Ninja
  • Pirates
  • Rock Raiders
  • Space
  • Star Wars
  • Studio
  • Technic
  • Time Cruisers
  • Town
  • Train
  • Western
  • Misc

Useful Links

  • Contribute!
  • 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)
  • About

In Honor of 1526

The classic space set that never was.

Copyright © 2022 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.