That sounds very sophisticated Geoff. I wouldn't even know where to look for the parts needed.
Anyhoo, plywood + L-bracket idea was a disaster. The execution was anyway. Probably could make it work - if I bought stiffer (thicker) plywood and thought more about how to stiffen the joins between panels too.
So I went back to my Meccano Dob after all. Added plywood to the swivel base, and plywood for ground board. Big difference. Rubber feet in pic had got to go - they are a major source of vibrations. I replaced them with steel bolts - much better. Bigger ground board might be good idea for better AZ stability when near zenith. I'll also add ALT friction control tomorrow. Otherwise it's not looking too bad. Might even get to try it out tomorrow night.
