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 3710 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

6334 – Back A

June 27, 2022June 27, 2022 Master Builder

6336 – Back A

July 12, 2021July 12, 2021 Master Builder

6368 – Back A

May 15, 2022May 19, 2022 Master Builder

1761 – Back A

April 10, 2023April 10, 2023 Master Builder

Space 3-Pack: Exploriens

October 2, 2024October 3, 2024 Master Builder

6876 – Back C

November 16, 2019July 31, 2023 Master Builder

EXPLORE MORE OFFICIAL SETS

ABCs Classic Town Extra Large Builds Harbor Official Sets Town Town Sets Wrecker

6541: Intercoastal Seaport

January 25, 2022February 12, 2025 Master Builder

Year Released: 1991BricklinkInstructions *Alternate Build Connection: M:Tron Prototypes (BrickJournal: Issue 6 Volume 2, BrickJournal: Issue 12, LEGO® Space: 1978-1992)

Official Sets Paradisa Town Town Sets Very Small Builds

1761: Paradisa Speedboat

April 10, 2023April 10, 2023 Master Builder

Duplicate Set Number Official Sets UFO UFO Sets Very Small Builds

6901-2: Space Plane

December 16, 2025December 16, 2025 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds Space

6883: Terrestrial Rover

October 22, 2019October 21, 2024 Master Builder

Adventurers Adventurers Sets Desert Large Builds Official Sets

5978: Sphinx Secret Surprise

October 28, 2019April 4, 2020 Master Builder

Official Sets Pirates Pirates I Pirates Sets Small Builds

6258: Smuggler’s Shanty

July 8, 2022July 8, 2022 Master Builder

Large Builds Model Team Model Team Sets Official Sets

5510: Off Road 4×4

February 10, 2026February 10, 2026 Master Builder

Classic Town Official Sets Race Town Town Sets Very Small Builds

1760: Go-Cart

April 11, 2023April 11, 2023 Master Builder

Extra Large Builds Model Team Model Team Sets Official Sets

5580: Highway Rig

February 9, 2026February 9, 2026 Master Builder

Classic Town Harbor Official Sets Small Builds Town Town Sets Wrecker

6513: Glade Runner

May 10, 2022May 10, 2022 Master Builder

Official Sets Pirates Pirates I Pirates Sets Very Small Builds

1747: Treasure Cave

May 6, 2022May 6, 2022 Master Builder

Exploriens Exploriens Sets Medium Builds Official Sets

6938: Scorpion Detector

March 21, 2023March 5, 2026 Master Builder

Batman I BATMAN™ BATMAN™ Sets Large Builds Official Sets

7782: The Batwing: Joker’s Aerial Assault

March 27, 2026March 27, 2026 Master Builder

Medium Builds Official Sets Pirates Pirates I Pirates Sets

6268: Renegade Runner

April 9, 2020July 13, 2021 Master Builder

Building Classic Town Medium Builds Official Sets Town Town Sets

6360: Weekend Cottage

October 19, 2019April 4, 2020 Master Builder

Episode I Official Sets Small Builds Star Wars Star Wars Sets

7101: Lightsaber Duel

October 28, 2021October 28, 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.