It's now green. The wall is 15 steel supports on a radius matching the dome base ring centreline, set in concrete. A bead of waterproof filler around the base concrete and sheeting stops rising damp along with a waterproof membrane painted inside over the concrete. Inside slab is a centre circle, isolated from the outer concentric slab by a gap filled with foam strip. It is a buzz making and using your own dome.
First light is a pretty cool experience.
I was inspired by Joe's success and have him totally to thank. Pride might make me hesitant to mention any downfalls in my work but in the spirit of Joe's page and all ATM pages, I must point out any negatives in my dome so that others can at least make a change or improve. There is a tiny part of sky I can't get for about half hour because of the overlap. When pouring the centre slab I put a conduit in the pour from it to the outside wall, so I could keep all cables off the floor to stop tripping.