Skip to content
Back of the Box Builds

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
    • Submit Instructions!
    • New Instructions
    • New Official Sets
    • New Alternate Builds
    • Minifigs
    • Very Small Builds
    • Small Builds
    • Medium Builds
    • Large Builds
    • Extra Large Builds
    • How BOTBB was Built
  • 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 A

August 25, 2023March 14, 2025 Master Builder 4151 Views

From: 6901: Mobile Lab
Name: Space Lab Tower 1
Instructions: View PDF | Download .io File

Contributions

  1. Name, PDF and .io file submitted August 26, 2023 by: Mr.AstonishedRaccoon
  • ← 6035 – Back D
  • 6901 – Back B →

You May Also Like

6659 – Back B

April 10, 2021April 10, 2021 Master Builder

Ultimate Alien

March 22, 2025March 22, 2025 Master Builder

4708 – Back B

August 1, 2024August 8, 2024 Master Builder

6545 – Back A

June 2, 2022June 2, 2022 Master Builder

1628 – Back B

November 25, 2020July 25, 2024 Master Builder

6431 – Back A

January 20, 2022January 20, 2022 Master Builder

EXPLORE MORE OFFICIAL SETS

6373: Motorcycle Shop
Classic Town Medium Builds Official Sets Town Town Sets Traffic 

6373: Motorcycle Shop

January 6, 2022January 6, 2022 Master Builder

Year Released: 1984BricklinkInstructions

7260: Wookiee Catamaran
Episode III Large Builds Official Sets Star Wars Star Wars Sets 

7260: Wookiee Catamaran

March 1, 2023March 1, 2023 Master Builder
6274: Caribbean Clipper
Box Story Imperial Soldiers Large Builds Niels Milan Pedersen Official Sets Pirates Pirates I Pirates Sets 

6274: Caribbean Clipper

February 8, 2022February 21, 2025 Master Builder
6249: Pirates Ambush
Medium Builds Official Sets Pirates Pirates I Pirates Sets 

6249: Pirates Ambush

November 16, 2019February 20, 2025 Master Builder
6347: Monorail Accessory Track
Classic Town Official Sets Supplemental Town 

6347: Monorail Accessory Track

August 27, 2023August 27, 2023 Master Builder
6982: Explorien Starship
Exploriens Exploriens Sets Extra Large Builds Official Sets 

6982: Explorien Starship

November 9, 2019December 13, 2024 Master Builder
4502: X-wing Fighter (Dagobah)
Episode IV/V/VI Extra Large Builds Official Sets Star Wars Star Wars Sets 

4502: X-wing Fighter (Dagobah)

May 15, 2023May 15, 2023 Master Builder
6190: Shark’s Crystal Cave
Aquashark Aquazone Aquazone Sets Large Builds Official Sets 

6190: Shark’s Crystal Cave

July 13, 2021January 20, 2022 Master Builder
4593: Zero Hurricane & Red Blizzard
Drome Racers Official Sets Racers Small Builds 

4593: Zero Hurricane & Red Blizzard

January 27, 2025February 21, 2025 Master Builder
6642: Police Helicopter
Classic Town Official Sets Police Small Builds Town Town Sets 

6642: Police Helicopter

April 8, 2020April 8, 2020 Master Builder
6615: Eagle Stunt Flyer
Airport Classic Town Official Sets Small Builds Town Town Sets 

6615: Eagle Stunt Flyer

January 5, 2022January 5, 2022 Master Builder
6988: Alpha Centauri Outpost
Blacktron II Blacktron II Sets Large Builds Official Sets 

6988: Alpha Centauri Outpost

October 24, 2019October 24, 2019 Master Builder
6030: Catapult
Black Falcons Castle Castle Sets Official Sets Small Builds 

6030: Catapult

April 2, 2022April 2, 2022 Master Builder
6236: King Kahuka
Islanders Official Sets Pirates Pirates I Pirates Sets Small Builds 

6236: King Kahuka

December 28, 2021December 28, 2021 Master Builder
6820: Starfire I
Classic Space Classic Space Sets Official Sets Space Very Small Builds 

6820: Starfire I

January 12, 2021January 12, 2021 Master Builder
5988: Pharaoh’s Forbidden Ruins
Adventurers Adventurers Sets Box Story Desert Extra Large Builds Official Sets 

5988: Pharaoh’s Forbidden Ruins

October 29, 2019March 7, 2025 Master Builder

BOXES

INSTRUCTIONS

FAVORITES

MINIFIGS

About This Site

Logo
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.