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
    • 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
    • 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 Instructions Added Medium Alt Build Medium Builds Space Space Police I Space Police I Alternate Builds 

6781 – Back A

April 19, 2021May 17, 2023 Master Builder 5152 Views

From: 6781: SP-Striker
Name: SP-Sentinel 1
Instructions: View PDF | Download .io File

Contributions

  1. Name, PDF and .io file submitted on November 17, 2021 by: Krysto
  • ← 6781: SP-Striker
  • 6077-2: Forestmen’s River Fortress →

You May Also Like

6814 – Back C

April 6, 2020October 25, 2021 Master Builder

4794 – Back B

February 12, 2024February 21, 2024 Master Builder

6594 – Back B

February 5, 2023July 15, 2025 Master Builder

6054: Forestmen’s Hideout

April 10, 2021July 29, 2023 Master Builder

1526 – Back A

April 4, 2020March 14, 2025 Master Builder

6885 – Back C

June 5, 2023June 6, 2023 Master Builder

EXPLORE MORE OFFICIAL SETS

4730: The Chamber of Secrets
Chamber of Secrets Extra Large Builds Harry Potter Harry Potter Sets Official Sets 

4730: The Chamber of Secrets

January 23, 2024January 23, 2024 Master Builder

Year Released: 2002BricklinkInstructions

6986: Mission Commander
Bjarne Tveskov Extra Large Builds Official Sets Space Space Police I Space Police I Sets 

6986: Mission Commander

April 3, 2022July 29, 2023 Master Builder
6718: Raindance Ridge (Rain Dance Ridge)
Indians Jørn Thomsen Official Sets Small Builds Western Western Sets 

6718: Raindance Ridge (Rain Dance Ridge)

August 4, 2020July 29, 2023 Master Builder
6419: Rolling Acres Ranch
Large Builds Official Sets Paradisa Town Town Sets 

6419: Rolling Acres Ranch

August 10, 2026August 10, 2026 Master Builder
6312: Straight Road Plates
Classic Town Official Sets Supplemental Town 

6312: Straight Road Plates

October 10, 2022October 10, 2022 Master Builder
6263: Imperial Outpost
Imperial Guards Medium Builds Official Sets Pirates Pirates I Pirates Sets 

6263: Imperial Outpost

February 21, 2025February 21, 2025 Master Builder
1795 – Side R
Bonus/Value Packs Imperial Guards Official Sets Pirates Pirates Alternate Builds Pirates I Small Builds 

1795 – Side R

March 30, 2026March 30, 2026 Master Builder
7700: Stealth Hunter
ABCs Exo-Force Exo-Force Sets Medium Builds Official Sets 

7700: Stealth Hunter

March 26, 2026March 26, 2026 Master Builder
1728 (6145): Crystal Crawler {with Aqua Playscape}
ABCs Aquanauts Aquazone Aquazone Sets Box Plus Official Sets Playscape/Play Stage Box Small Builds 

1728 (6145): Crystal Crawler {with Aqua Playscape}

August 1, 2023March 22, 2025 Master Builder
6790: Bandit’s Wheelgun
Cowboys Official Sets Very Small Builds Western Western Sets 

6790: Bandit’s Wheelgun

October 10, 2023October 10, 2023 Master Builder
6057: Sea Serpent
Black Knights Castle Castle Sets Medium Builds Official Sets 

6057: Sea Serpent

April 14, 2025April 14, 2025 Master Builder
6473: Res-Q Hovercraft
Large Builds Official Sets Res-Q Town Town Sets 

6473: Res-Q Hovercraft

January 20, 2022January 20, 2022 Master Builder
6841: Mineral Detector
Classic Space Classic Space Sets Official Sets Very Small Builds 

6841: Mineral Detector

October 3, 2019October 3, 2019 Master Builder
6977: Arachnoid Star Base
Insectoids Insectoids Sets Large Builds Official Sets 

6977: Arachnoid Star Base

November 9, 2019November 9, 2019 Master Builder
6590: Vacation Camper
Classic Town Official Sets Small Builds Town Town Sets Traffic 

6590: Vacation Camper

July 8, 2022July 8, 2022 Master Builder
6077: Knight’s Procession
Castle Castle Sets Classic Castle Official Sets Very Small Builds 

6077: Knight’s Procession

July 13, 2021July 13, 2021 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
  • 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.