Very nice ambitious project. Its really nice to see somebody working on a brand new motherboard for A500/+ machines.
I wonder if it would be possible to create a similair board for A500/+ or even A1200 etc.. which would incorporate a 68030, LAN network, CF/SD reader, built-in IDE or Sata controller, DDR ram sockets and perhaps some sort of SD/FF and maybe even a local mini-pci type slot which can take for example a RTG.