Jack,
Sounds like a great idea, seems a shame that there does not seem to be a great deal of interest.
I'm not exactly clear on the standard and just a question, had you considered the gauge o guild standard for modular boards? It may had made the modules more useful, but I suppose it does not matter a great deal if 'middle' boards are built.
I'll follow your progress with interest.
Edit. I've read all the posts now