Skip to content
Back of the Box Builds

Back of the Box Builds

LEGO Alternate Builds!

  • SETS
    • Adventurers
    • Aquazone
    • 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
    • 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
ABCs Classic Space Classic Space Sets Large Builds Official Sets Space 

6783: Sonar Transmitting Cruiser

May 8, 2022August 15, 2023 Master Builder 4878 Views

Year Released: 1986
Bricklink
Instructions

*Alternate Build Connection: BrickJournal Issue 6 Volume 2 Page 39 – Proto 1

Back A
Back B
Back C
Back D
  • ← 6641 – Back E
  • 6783 – Back A →

You May Also Like

5521 – Back A

January 12, 2021January 12, 2021 Master Builder

6949 – Back B

July 12, 2022July 13, 2022 Master Builder

1496: Rally Car

October 20, 2019October 8, 2024 Master Builder

6367: Truck

February 17, 2023February 17, 2023 Master Builder

8064: Universal Motor Set 9V

February 8, 2024February 8, 2024 Master Builder

6074 – Inside B

October 14, 2021August 1, 2023 Master Builder

EXPLORE MORE OFFICIAL SETS

6433: Coast Watch (Coastwatch)
Medium Builds Official Sets Police Town Town Jr Town Sets 

6433: Coast Watch (Coastwatch)

July 10, 2024July 10, 2024 Master Builder

Year Released: 1999BricklinkInstructions

7203: Jedi Defense I
Episode I Official Sets Star Wars Star Wars Sets Very Small Builds 

7203: Jedi Defense I

June 27, 2022June 27, 2022 Master Builder
6662: Backhoe
Classic Town Construction Official Sets Small Builds Town Town Sets 

6662: Backhoe

July 8, 2022July 8, 2022 Master Builder
6898: Ice-Sat V
Ice Planet 2002 Ice Planet 2002 Sets Jørn Thomsen Medium Builds Official Sets Space 

6898: Ice-Sat V

June 8, 2020July 29, 2023 Master Builder
6346: Shuttle Launching Crew
Airport Classic Town Large Builds Official Sets Town Town Sets 

6346: Shuttle Launching Crew

November 20, 2020November 20, 2020 Master Builder
6278: Enchanted Island
Box Story Islanders Medium Builds Official Sets Pirates Pirates I Pirates Sets 

6278: Enchanted Island

February 20, 2025February 20, 2025 Master Builder
720: Basic Building Set
Basic Large Builds Official Sets Universal Building Set 

720: Basic Building Set

February 8, 2024February 9, 2024 Master Builder
6817: Beta Buzzer
ABCs Insectoids Insectoids Sets Official Sets Space Very Small Builds 

6817: Beta Buzzer

June 1, 2022March 22, 2025 Master Builder
6894: Invader
Blacktron Blacktron Sets Medium Builds Official Sets 

6894: Invader

November 20, 2019November 20, 2019 Master Builder
6985: Cosmic Fleet Voyager
ABCs Classic Space Classic Space Sets Extra Large Builds Official Sets 

6985: Cosmic Fleet Voyager

September 12, 2019August 16, 2023 Master Builder
894: Mobile Ground Tracking Station
Classic Space Classic Space Sets Jens Nygaard Knudsen Official Sets Small Builds Space 

894: Mobile Ground Tracking Station

January 12, 2021July 29, 2023 Master Builder
6237: Pirates’ Plunder
Official Sets Pirates Pirates I Pirates Sets Very Small Builds 

6237: Pirates’ Plunder

February 8, 2022February 8, 2022 Master Builder
6212: X-wing Fighter
Episode IV/V/VI Large Builds Official Sets Star Wars Star Wars Sets 

6212: X-wing Fighter

February 1, 2024February 1, 2024 Master Builder
8044: Universal Pneumatic Set
Medium Builds Official Sets Technic Technic Sets 

8044: Universal Pneumatic Set

August 23, 2024August 23, 2024 Master Builder
1787: Crater Cruiser
Medium Builds Official Sets Space Unitron Unitron Sets 

1787: Crater Cruiser

April 9, 2020July 18, 2020 Master Builder
6543: Sail N’ Fly Marina
Classic Town Extra Large Builds Harbor Official Sets Town Town Sets Wrecker 

6543: Sail N’ Fly Marina

July 22, 2022July 22, 2022 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
  • 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 © 2025 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.