Knowing that diodes and galvanometer amps generate heat, cooling was an important design criteria. Further, like my prior projectors I built, a solid aluminum baseplate was essential for optical stability. But that means attaching heat sinks, maybe adding fans, and sourcing a big chunk of aluminum. Then it dawned on me... why not do both? A little research quickly showed aluminum heat sinks are available in ALL kinds of sizes. Now normally you don't want the fins to just reflect down, but given the massive surface area, the overall plate is just warm, and widely distributed at that... success!