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 4443 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

6046: Hemlock Stronghold

November 18, 2021November 18, 2021 Master Builder

6211 – Back A

February 9, 2025February 13, 2025 Master Builder

6199 – Back A

February 18, 2025February 18, 2025 Master Builder

6337 – Back D

December 4, 2023December 4, 2023 Master Builder

1818: Aircraft and Ground Support Equipment and Vehicle

April 7, 2025April 7, 2025 Master Builder

6826 – Back D

September 26, 2019October 25, 2021 Master Builder

EXPLORE MORE OFFICIAL SETS

Classic Town Official Sets Supplemental Town

6312: Straight Road Plates

October 10, 2022October 10, 2022 Master Builder

Year Released: 1986Bricklink

Adventurers Adventurers Sets Desert Official Sets Small Builds

5928: Bi-Wing Baron

February 22, 2023February 22, 2023 Master Builder

ABCs Box Plus Classic Town Medium Builds Official Sets Playscape/Play Stage Box Race Town Town Sets

1821: Rally Racers

February 10, 2025March 22, 2025 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds Space

6880: Surface Explorer

May 4, 2020May 4, 2020 Master Builder

Medium Builds Official Sets Western Western Sets

6764: Sheriff’s Lock-Up

September 1, 2024September 1, 2024 Master Builder

Castle Castle Sets Dark Forest Official Sets Small Builds

6024: Bandit Ambush

April 16, 2021April 16, 2021 Master Builder

Exo-Force Official Sets Small Builds

7708: Uplink

August 11, 2023August 11, 2023 Master Builder

Episode IV/V/VI Official Sets Small Builds Star Wars Star Wars Sets

7106: Droid Escape

March 1, 2023March 1, 2023 Master Builder

Classic Town Official Sets Small Builds Town Town Sets Traffic

3442: Legoland California Truck Limited Edition

October 13, 2021October 13, 2021 Master Builder

Jørn Thomsen Official Sets Space Space Police II Space Police II Sets Very Small Builds

1916 (Kabaya: Space 3): Starion Patrol

January 19, 2022February 25, 2025 Master Builder

Box Plus Different Box Versions Official Sets Playscape/Play Stage Box Small Builds Time Cruisers Time Cruisers Sets

6499: Time Tunnelator with Time Machine

March 5, 2026March 5, 2026 Master Builder

ABCs Exo-Force Medium Builds Official Sets

7703: Fire Vulture

August 4, 2023March 26, 2026 Master Builder

Classic Town Harbor Medium Builds Official Sets Town Town Sets Wrecker

6596: Wave Master

September 15, 2022September 15, 2022 Master Builder

Black Falcons Castle Castle Sets Official Sets Small Builds

6035: Castle Guard

December 27, 2021December 27, 2021 Master Builder

Official Sets Race Town Town Sets Very Small Builds

6528: Sand Storm Racer

July 8, 2022July 8, 2022 Master Builder

BIONICLE BIONICLE Sets Large Builds Official Sets Playsets

8926: Toa Undersea Attack

March 3, 2026March 3, 2026 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.