Skip to content

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
THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Alternate Builds Classic Space Classic Space Alternate Builds Instructions Added Medium Alt Build Medium Builds Space

6901 – Back C

August 28, 2023March 14, 2025 Master Builder 4426 Views

From: 6901: Mobile Lab
Name: Convertible Cruiser Mobile Lab ¹
Instructions: View PDF | Download .io File

Contributions

Name, PDF and .io file submitted August 28, 2023 by: Mr.AstonishedRaccoon

← 854: Go-Kart
6901 – Back D →

You May Also Like

2162 – Back B

July 18, 2022July 18, 2022 Master Builder

6386 – Back B

June 17, 2022May 17, 2023 Master Builder

6884 – Back D

September 24, 2019October 25, 2021 Master Builder

6558 – Back B

December 29, 2021December 29, 2021 Master Builder

7475 – Back A

April 27, 2023April 27, 2023 Master Builder

1750 – Back A

July 13, 2021July 13, 2021 Master Builder

EXPLORE MORE OFFICIAL SETS

Classic Space Classic Space Sets Official Sets Very Small Builds

6824: Space Dart I

September 30, 2019October 6, 2019 Master Builder

Year Released: 1984Bricklink

Official Sets Power Miners Power Miners Sets Small Builds

8956: Stone Chopper

March 27, 2026March 27, 2026 Master Builder

9V Medium Builds Official Sets Town Train Train Sets

4532: Manual Level Crossing

May 22, 2026May 22, 2026 Master Builder

Official Sets Small Builds Space Spyrius Spyrius Sets Unitron Unitron Sets

1785: Introducing Crater Critters

December 28, 2021December 28, 2021 Master Builder

Episode III Large Builds Official Sets Star Wars Star Wars Sets

7260: Wookiee Catamaran

March 1, 2023March 1, 2023 Master Builder

ABCs Jørn Thomsen Medium Builds Official Sets Spyrius Spyrius Sets

6939: Saucer Centurion

November 9, 2019October 1, 2024 Master Builder

Classic Town Official Sets Small Builds Town Town Sets Traffic

6694: Car with Camper

May 19, 2022May 19, 2022 Master Builder

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

Bonus/Value Packs Castle Castle Sets Official Sets Royal Knights Small Builds Space Spyrius Spyrius Sets

1843: Space/Castle Value Pack

January 21, 2021September 13, 2023 Master Builder

Airport Classic Town Different Box Versions Extra Large Builds Official Sets Town Town Sets

6399: Airport Shuttle

February 24, 2023March 17, 2024 Master Builder

Classic Space Classic Space Sets Official Sets Space Very Small Builds

6802: Space Probe

October 10, 2022October 10, 2022 Master Builder

Official Sets Pirates Pirates I Pirates Sets Small Builds

6258: Smuggler’s Shanty

July 8, 2022July 8, 2022 Master Builder

Classic Space Classic Space Sets Large Builds Official Sets

6940: Alien Moon Stalker

September 12, 2019September 12, 2024 Master Builder

Classic Space Classic Space Sets Jens Nygaard Knudsen Official Sets Small Builds

897: Mobile Missile Command

September 14, 2019July 31, 2023 Master Builder

Castle Castle Sets Lion Knights Official Sets Small Builds

6010: Supply Wagon

July 13, 2021July 13, 2021 Master Builder

Classic Town Fire Official Sets Small Builds Town Town Sets

6525: Blaze Commander

May 4, 2020November 19, 2020 Master Builder

BOXES

INSTRUCTIONS

FAVORITES

MINIFIGS

About This Site

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.