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 3954 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

6907 – Back B

October 3, 2024October 3, 2024 Master Builder

6551 – Back D

November 21, 2023November 21, 2023 Master Builder

6901-2 – Back A

December 16, 2025December 16, 2025 Master Builder

6482 – Back B

May 18, 2022May 19, 2022 Master Builder

6501: Sport Convertible

July 8, 2022July 8, 2022 Master Builder

6970 – Inside E

January 20, 2021January 20, 2021 Master Builder

EXPLORE MORE OFFICIAL SETS

6056: Dragon Wagon
Castle Castle Sets Dragon Knights Official Sets Small Builds 

6056: Dragon Wagon

December 28, 2021June 30, 2022 Master Builder

Year Released: 1993BricklinkInstructions

6261: Raft Raiders
Medium Builds Official Sets Pirates Pirates I Pirates Sets 

6261: Raft Raiders

April 7, 2026April 7, 2026 Master Builder
381: Police Headquarters
Classic Town Large Builds Official Sets Police Town Town Sets 

381: Police Headquarters

July 27, 2023July 27, 2023 Master Builder
6280: Armada Flagship
Box Story Imperial Armada Large Builds Official Sets Pirates Pirates I Pirates Sets 

6280: Armada Flagship

July 13, 2021February 20, 2025 Master Builder
8860: Car Chassis (Auto Chassis)
Extra Large Builds Official Sets Technic Technic Sets 

8860: Car Chassis (Auto Chassis)

January 2, 2024January 2, 2024 Master Builder
6080: King’s Castle
ABCs Castle Castle Sets Extra Large Builds Lion Knights Niels Milan Pedersen Official Sets 

6080: King’s Castle

October 5, 2019August 16, 2023 Master Builder
854: Go-Kart
Medium Builds Official Sets Technic Technic Sets 

854: Go-Kart

August 28, 2023January 6, 2025 Master Builder
6887: Allied Avenger
ABCs Blacktron II Blacktron II Sets Official Sets Small Builds 

6887: Allied Avenger

October 5, 2019July 31, 2023 Master Builder
6150 (6159): Crystal Detector
ABCs Aquazone Aquazone Sets Hydronauts Official Sets Small Builds 

6150 (6159): Crystal Detector

February 23, 2023February 18, 2025 Master Builder
4537: Twin Tank Transport
9V Medium Builds Official Sets Train Train Sets 

4537: Twin Tank Transport

August 10, 2026August 10, 2026 Master Builder
6803: Space Patrol
Classic Space Classic Space Sets Official Sets Very Small Builds 

6803: Space Patrol

September 21, 2019February 15, 2026 Master Builder
6895: Spy-Trak I
Jørn Thomsen Medium Builds Official Sets Space Space Police I Space Police I Sets 

6895: Spy-Trak I

April 8, 2020September 12, 2024 Master Builder
6643: Fire Truck
Classic Town Fire Official Sets Small Builds Town Town Sets 

6643: Fire Truck

July 2, 2024July 2, 2024 Master Builder
6433: Coast Watch (Coastwatch)
Medium Builds Official Sets Police Town Town Jr Town Sets 

6433: Coast Watch (Coastwatch)

July 10, 2024July 10, 2024 Master Builder
6049: Viking Voyager
Castle Castle Sets Lion Knights Official Sets Small Builds 

6049: Viking Voyager

June 30, 2022June 30, 2022 Master Builder
6310: T-Road Plates
Classic Town Official Sets Supplemental Town 

6310: T-Road Plates

October 10, 2022May 5, 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.