Or as done as I'll ever be. I've got all the traces finished and the layout complete. Some things still don't make too much sense, but I won't be able to figure them out until I finish the main processor board and figure out what those connections are doing. 

Next up I think I want to make a DIN 41612 extension cable so I can do some probing on the board while it is running, followed by making a smaller version of the board.

Just for fun, I thought I'd see how much this board would cost on Oshpark - $476! These boards are huge.