Skip to content
Back of the Box Builds

Back of the Box Builds

LEGO Alternate Builds!

  • SETS
    • Adventurers
    • Aquazone
    • Belville
    • BATMAN™
    • BIONICLE
    • Building Set with People
    • Castle
    • Duplo
    • Fabuland
    • Harry Potter
    • Holiday and Event
    • LEGOLAND
    • Model Team
    • Pirates
    • Space
    • Star Wars
    • Technic
    • Train
    • 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
ABCs Alternate Builds Classic Space Classic Space Alternate Builds Instructions Added Space Very Small Alt Build Very Small Builds 

6901 – Back B

August 25, 2023June 23, 2025 Master Builder 3942 Views

From: 6901: Mobile Lab
Name: Classic Space Rover 2 1
Instructions: View PDF | Download .io File

*Alternate Build Connection: 1980 Medium US Assortment Guide (106917/107017-US), 6870 – Back A, 6901 – Back E, 6989 – Back A, 6984: Galactic Mediator

Contributions

  1. Name, PDF and .io file submitted August 26, 2023 by: Mr.AstonishedRaccoon
  • ← 6901 – Back A
  • 6347: Monorail Accessory Track →

You May Also Like

6901 – Back A

August 25, 2023March 14, 2025 Master Builder

6066 – Inside A

September 24, 2023October 6, 2023 Master Builder

6336 – Back A

July 12, 2021July 12, 2021 Master Builder

6985 – Inside B

September 28, 2019November 18, 2021 Master Builder

381 – Back B

July 27, 2023July 27, 2023 Master Builder

6670 – Back B

February 3, 2022February 9, 2022 Master Builder

EXPLORE MORE OFFICIAL SETS

6699: Cycle Fix-It Shop
Classic Town Official Sets Small Builds Town Town Sets Traffic 

6699: Cycle Fix-It Shop

October 28, 2025October 28, 2025 Master Builder

Year Released: 1987BricklinkInstructions

720: Basic Building Set
Basic Large Builds Official Sets Universal Building Set 

720: Basic Building Set

February 8, 2024February 9, 2024 Master Builder
1628: Santa on Sleigh with Reindeer
Holiday and Event Holiday and Event Sets Official Sets Small Builds 

1628: Santa on Sleigh with Reindeer

November 25, 2020July 25, 2024 Master Builder
6959: Lunar Launch Site
Jørn Thomsen Large Builds Official Sets Spyrius Spyrius Sets 

6959: Lunar Launch Site

April 27, 2020July 29, 2023 Master Builder
2151: Robo Raider
Medium Builds Official Sets Robo Force Robo Force Alternate Builds Robo Force Sets Space 

2151: Robo Raider

January 14, 2021September 3, 2025 Master Builder
5847: Surfers’ Paradise
Belville Belville Sets Lion Knights Medium Builds Official Sets Recreation 

5847: Surfers’ Paradise

April 2, 2025April 2, 2025 Master Builder
6805: Astro Dasher
Classic Space Classic Space Sets Official Sets Space Very Small Builds 

6805: Astro Dasher

December 10, 2025December 10, 2025 Master Builder
6036: Skeleton Surprise
Castle Castle Sets Official Sets Royal Knights Small Builds 

6036: Skeleton Surprise

February 28, 2023February 28, 2023 Master Builder
6560: Diving Expedition Explorer
Divers Extra Large Builds Official Sets Town Town Sets 

6560: Diving Expedition Explorer

April 3, 2022April 3, 2022 Master Builder
4920: Rapid Rider
Official Sets Rock Raiders Rock Raiders Sets Very Small Builds 

4920: Rapid Rider

March 1, 2023March 1, 2023 Master Builder
6991: Monorail Transport Base
Extra Large Builds Jørn Thomsen Official Sets Space Unitron Unitron Sets 

6991: Monorail Transport Base

September 28, 2019July 29, 2023 Master Builder
6246: Crocodile Cage
Islanders Official Sets Pirates Pirates I Pirates Sets Small Builds 

6246: Crocodile Cage

January 26, 2022January 26, 2022 Master Builder
42089: Power Boat
2 in 1 Medium Builds Official Sets Technic Technic Sets 

42089: Power Boat

August 28, 2026August 28, 2026 Master Builder
6958: Android Base
Exploriens Exploriens Sets Large Builds Official Sets 

6958: Android Base

November 9, 2019April 16, 2021 Master Builder
6017: King’s Oarsman
Castle Castle Sets Lion Knights Official Sets Small Builds 

6017: King’s Oarsman

September 24, 2024September 24, 2024 Master Builder
6983: Ice Station Odyssey
Box Story Ice Planet 2002 Ice Planet 2002 Sets Jørn Thomsen Large Builds Official Sets Space 

6983: Ice Station Odyssey

November 9, 2019March 20, 2025 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
  • BATMAN
  • Bionicle
  • Belville
  • Building Set with People
  • Castle
  • Duplo
  • Fabuland
  • Harry Potter
  • Holiday and Event
  • LEGOLAND
  • Model Team
  • Pirates
  • Space
  • Star Wars
  • Technic
  • Train
  • 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 © 2026 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.