🧪 Scale Prototype Test Build

Teams build a quick prototype of the selected organizer, fountain base, or roundabout model using cardboard, compasses, rulers, protractors, string, grid paper, and tape, then run a short test plan tied to their criteria. They measure actual prototype dimensions, compare expected versus observed arc length, sector area, scale factor, and relevant volume estimates, and upload one in-progress photo plus one calculation set to the project log for feedback. Before cleanup, partners complete the required midpoint check-in by comparing one math move and one teamwork move that helped progress, then teams note one revision target for the next phase.