Great work Loren.

One quick thing. Shouldn't you also run the ground of the power socket to the case chassis? Anyone a sparky to confirm this?
OK two quick things. Maybe put in a disclaimer about connecting power things if you mention power connections.

drat. Three quick things. If you're switching mains, I think you should be using a dual throw dual pole (DPDT) switch to totally isolate the mains power from the rest of the unit.

Just some suggestions. Great tip for cutting the sled opening. did you have to use the Dremel for it?