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
- 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 3898 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

6207 – Back A

February 1, 2024February 1, 2024 Master Builder

6268 – Back A

April 9, 2020April 9, 2020 Master Builder

710 – Inside F

February 22, 2024February 22, 2024 Master Builder

6552 – Back C

May 7, 2024May 11, 2024 Master Builder

Book 260 – Page 32-33

July 21, 2025August 2, 2025 Master Builder

6737 – Back B

April 7, 2026April 22, 2026 Master Builder

EXPLORE MORE OFFICIAL SETS

Official Sets Small Builds Town Town Sets

1665: Duel FX Racers

April 30, 2024April 30, 2024 Master Builder

Year Released: 1990BricklinkInstructions

Classic Town Official Sets Small Builds Town Town Sets Traffic

6699: Cycle Fix-It Shop

October 28, 2025October 28, 2025 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds

6825: Cosmic Comet

September 12, 2019March 18, 2024 Master Builder

Holiday and Event Holiday and Event Sets Official Sets Small Builds

1549: Santa and Chimney

February 27, 2023March 5, 2026 Master Builder

Large Builds Launch Command Official Sets Town Town Sets

6544: Shuttle Transcon 2

July 20, 2022July 20, 2022 Master Builder

Daniel August Krentz Imperial Soldiers Medium Builds Official Sets Pirates Pirates I Pirates Sets

6267: Lagoon Lock-Up

October 11, 2021July 29, 2023 Master Builder

Basic Official Sets Small Builds Universal Building Set

385-2: Build-N-Store Chest

September 8, 2025September 8, 2025 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds Space

6880: Surface Explorer

May 4, 2020May 4, 2020 Master Builder

Bonus/Value Pack Sets Bonus/Value Packs Official Sets Race Small Builds Town

1978-2: Town Value Pack

October 10, 2024October 10, 2024 Master Builder

BIONICLE BIONICLE Sets Large Builds Official Sets Playsets

8926: Toa Undersea Attack

March 3, 2026March 3, 2026 Master Builder

Airport Classic Town Official Sets Town Town Sets Very Small Builds

6515: Stunt Copter

February 2, 2022February 2, 2022 Master Builder

Classic Town Fire Official Sets Town Town Sets Very Small Builds

6511: Rescue Runabout

May 10, 2022May 10, 2022 Master Builder

Black Knights Castle Castle Sets Official Sets Small Builds

1491: Dual Defender

October 11, 2021October 11, 2021 Master Builder

Box Story Fabuland Fabuland Sets Medium Builds Official Sets

132: Cottage

March 1, 2023April 3, 2024 Master Builder

Blacktron Blacktron Sets Bonus/Value Packs Castle Castle Sets Classic Town Forestmen Official Sets Small Builds Space Town Traffic

1675: Legoland Triple Pack

October 12, 2021October 12, 2021 Master Builder

Gas Station Medium Builds Official Sets Town Town Jr Town Sets

6548: Octan Gas Station

October 12, 2021October 12, 2021 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
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.