That certainly puts a whole new perspective on The Magic School Bus. Part of me regrets not buying a Gigabyte Brix PC with an integrated projector when they could be had for a couple hundred bucks a few years back. That would be pretty slick to use, but this solution isn't bad. The plastic shell keeps everything tidy and protected from overzealous vacuum robots, and it's stable enough to place nearly anywhere.

Back to the actual building of the controller. I've decided to continue pursuing the spin-actuated mechanical keyboard switch plan. An errant paint roller in the back of my car turned out to fit perfectly inside the rollers I picked. That made a huge difference in ease of construction and proved easy to integrate into my design. However, I may still need to source a switch that actuates at a shallower depth, so I can leave a larger gap and potentially reduce spinning resistance even further. A hair trigger is desirable in this case.