It's ready for its first shakedown cruise! I decided to remove all MAME games from RetroPie and stick with the ones that are most appropriate for the SNES-style controller; namely, Atari 2600, NES, and SNES games. I'd like to toss PS2 games on at some point, but not today.
Today is all about setting up the RetroPie rig in the dining room so my son and his friends can spend a few hours with it. Who better to put it through its paces than a gaggle of teenagers? If it goes over well, then I'll tweak it some more and bring it to the annual family reunion.
That should do it for now. I'm really happy with the way this went and will likely add more to this thread as circumstances warrant.