Hello chaps, thought I'd show my face and answer a couple of questions

Cracking stuff there SI, you've really done a great job on them

The cost of what SI wanted was £15 in total and that was for four bases and 30 rings, the bases being 1.5mm acrylic and the rings being 1mm acrylic. These are based on Steve's measurements and the postage was £2 in the UK but any size, arrangemement or quantity can be sorted.
I'm happy to accept any custom requirements that any of you have so just drop me a line at
info@oshiromodelterrain.co.uk
Capt, drop me a pm or mail and we'll go from there.
Bit of advice for those wanting to work with acrylic for the first time, DON'T use a hole saw for cutting through acrylic because it will shatter and send little shards of or acrylic everywhere and believe me, the buggers hurt! You will need to key the surface aswell, a bit of 180 grit sandpaper should do the trick, or, if you want them clear then no problems

cheers
James