No problem. I'll post anything else I find of use. Not started anything myself yet, I'm holding off until the double garage has been converted into a games room, then I'll have a decent place to store my boards. Work on the garage was due to start in may, but obviously the current situation is going to delay that.
I'm going for styrofoam boards 40mm or 50mm thick....without a base, seems to work fine for people I've spoken too.