Requirement
4. Build the model you chose in requirement 3
Required Often forgotten
The five options are printed here but chosen a requirement earlier. The stem adds its own condition: before beginning any model, discuss your approach with your counselor, including possible use of CAD or 3D modeling, and present both your plans and the completed model.
Notes and warnings
Warning. THE PRINTED BOOK GETS EVERY METRIC CONVERSION ON THIS REQUIREMENT WRONG, AND YOUR COUNSELOR MAY BE WORKING FROM IT. The 2025 Boy Scout Requirements book gives the architectural scale as 50:1, the structural as 8:1, the process as 15:1 and the industrial as 10:1 or 25:1. Every one of those is written the wrong way round, and a ratio of 50:1 would describe a model fifty times larger than the house. Three of the five are the wrong number as well. The true values are 1:48, 1:8, 1:16, 1:12 and 1:24, which is what the current page prints. Arithmetic settles this rather than authority: a foot is twelve inches, so a quarter inch to the foot is one part in forty-eight. Use the fractional scale, which both sources state identically, and ignore the parenthesis in the book.
What this is made of
Where this step comes from
- Model Design and Building Merit Badge Requirements (Merit Badge Hub, last modified 2025-12-31), Requirement 4 · The requirement asks you to discuss your approach with your counselor before beginning any model, and to present both your plans and the completed model.