I didn't have any real project in mind for this board, so I just picked fun features as I went along.

I decided I should make the board smaller, smaller is always better. Pad only USB A plugs are cool. I also perforated it in case I wanted to get rid of it once it is programmed.

Adding a battery also seemed like a good idea. We have 2032 snaps, and this gives it some versatility if I come up with a project that requires it on the next rev.

Through hole headers didn't make sense to me. This isn't going on a breadboard any time soon, so I just made pads go to the edge and turned off the holes in my CAM step. Totally lazy, but it really is a one off, and I didn't feel like taking more than an hour to work on it.

I really enjoy the zen of routing single sided boards, so I used a couple of 1206 zero ohm resistors and ran 6 mil traces.

The battery on the back stopped me from dropping vias altogether, so I made them 1mm drills and avoided a toolchange on the PCB plotter.