I loved seeing Ben turn the little Namco upright cabinet into a more portable unit. I didn't have a need for anything that complicated in a build (I have enough arcades made from Raspberry Pi), but I really did like the idea of making all 4 games available on the tiny machine. So with about 30 minutes of very fine soldering and probably an excessive amount of hot glue, I made all 4 games select-able from outside the cabinet.
Pac-Man
Galaxian
Space Invaders
Ms. Pac Man
All select-able via a set of jumpers.
The only thing I haven't decided yet is if I want to scan in the artwork and make something more custom. But for now I'm just having fun trying not to drop it while playing games.