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 4354 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

6473 – Back A

January 20, 2022January 20, 2022 Master Builder

4555 – Back D

January 2, 2024January 2, 2024 Master Builder

6349 – Back A

July 1, 2021July 1, 2021 Master Builder

710 – Back A

February 22, 2024February 22, 2024 Master Builder

885: Space Scooter

January 27, 2024May 13, 2026 Master Builder

6285 – Back B

August 3, 2023August 3, 2023 Master Builder

EXPLORE MORE OFFICIAL SETS

Classic Town Hospital Official Sets Small Builds Town Town Sets

6666: Ambulance

October 30, 2021October 30, 2021 Master Builder

Year Released: 1994BricklinkInstructions

Exo-Force Official Sets Small Builds

7708: Uplink

August 11, 2023August 11, 2023 Master Builder

Classic Town Official Sets Recreation Small Builds Town Town Sets

6595: Surf Shack

April 9, 2020April 9, 2020 Master Builder

Classic Space Classic Space Sets Large Builds Official Sets

6929: Starfleet Voyager

September 22, 2019April 3, 2023 Master Builder

Airport Classic Town Official Sets Town Town Sets Very Small Builds

6529: Ultra Light I

July 14, 2022July 14, 2022 Master Builder

9V Official Sets Small Builds Town Train Train Sets

4525: Road and Rail Repair

July 22, 2026July 22, 2026 Master Builder

ABCs Classic Space Classic Space Sets Medium Builds Official Sets Space

6931: FX-Star Patroller

January 12, 2021March 20, 2025 Master Builder

Box Story Fabuland Fabuland Sets Medium Builds Official Sets

132: Cottage

March 1, 2023April 3, 2024 Master Builder

Classic Town Extra Large Builds Gas Station Official Sets Town Town Sets Wrecker

6394: Metro Park & Service Tower

February 17, 2023February 17, 2023 Master Builder

Extra Large Builds Official Sets Studio Sets Studios

1382: Scary Laboratory

August 10, 2026August 10, 2026 Master Builder

Classic Town Official Sets Supplemental Town

6312: Straight Road Plates

October 10, 2022October 10, 2022 Master Builder

Exploriens Exploriens Sets Medium Builds Official Sets

6938: Scorpion Detector

March 21, 2023March 5, 2026 Master Builder

Alpha Team Alpha Team Sets Medium Builds Mission Deep Sea Official Sets

4789: AT Aquatic Mech

February 12, 2024February 21, 2024 Master Builder

Classic Town Hospital Medium Builds Official Sets Town Town Sets

6356: Med-Star Rescue Plane

March 16, 2022March 16, 2022 Master Builder

Classic Town Fire Medium Builds Official Sets Town Town Sets

6480: Hook and Ladder Truck

July 8, 2022July 8, 2022 Master Builder

Airport Classic Town Medium Builds Official Sets Town Town Sets

6673: Solo Trainer

November 18, 2020November 18, 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.