What do you guys think about following inexpensive solution for a giant 16x16 Duo-LED Button matrix? :) I got this inspiration from the Flame Six-in-a-Row project, the creator Per Salzwedel was very helpful and gave me the construction details. Self-adhesive "3M elastic buffers" (rubber feets) are used as button caps. Costs: ca. 0.06 EUR pp. if we organize a bulk order. Buttons are "TASTER 3301", available at Reichelt for 0.11 EUR pp. Single-color LEDs are "SLK 5MM R