I just bought an RC2014 kit ( http://rc2014.co.uk ), which bears some similarity to what you're talking about. A larger community making cards for that computer would be really cool.
That is almost exactly what my self-designed/built computers looked like. The baseboards were longer and used an edge connector and card format that was popular at the time in industrial applications:
This would be a fun project to work on if I could set aside some time. FIRST robotics build season (http://www.firstinspires.org/) is starting this weekend. I mentor one of the local teams. This sucks-up most of my free time for a few months.
