CNC-milled collapsible upright piano shell built to replace hauling a real piano to exhibitions — assembles via slots, holes, and pegs with no tools, and disassembles flat for storage.

A fully open source, 38-foot, 4-lane pinewood derby timing system built for Cub Scout Pack 2222 — Arduino Mega, custom PCB, IR sensors, solenoid starting gate, and 7-segment displays.