Redesigned completely into two separate PCBs. Interconnection is a single 50-way ribbon cable with IDC sockets. Required gerber files for both boards attached as zip files in the release.
This latest design provides a single continuous edge-cut pattern that should allow almost any PCB production house to produce the board as a single PCB below the normal 100mm x 100mm limit.
The necessary Gerber files needed to have the board produced are included in the attached zip file.