I remember a prev. image of this dome - also having the dome rings join at a tangent point. I liked that one also. I'm jealous of your execution, Peter it always seems flawless. Its very beautiful (again).
Thanks for your comments. Pyro PMK makes a BIG difference ! It will give a medium format negative large format resolution, and allow to handle a longer tonal scale. I find the negatives easier to print and according to the friend who scans my negatives, he mentioned similar benefits during his process as well.