I've created a preliminary version of the PCB for the second revision. I still need to replace a few footprints and double check all the connections before sending it out. It's amazing how much extra you can fit when you don't have a massive DIP-28 taking up half the board.

This is going to be a challenging board to build. I have never reflowed before, and I think that is going to be required for some of these tiny footprints. I've seen others place the PCB on a clothes iron to melt the solder paste, perhaps I'll give that a spin. I have a few weeks to figure it out.