I came across your profile, looking for some help for a project in Bavaria. In a nutshell: We own a old farm house with an attached barn from the 16th century. The idea we have is, instead of any typical refurbishment, to built in the barn an [little cut of] and ancient arena, either beton cire or metal (copper). Sounds probably a little crazy, but when you see the pictures you will understand.
I am looking for someone that can help me in drawing plans for the arena, with variations etc. until the final shape is found. This should happen in typical, though probably rather simple, architecture software, incl 3D. The ultimate output would be a plan that can be shares with a metal worked, who can use the details to cut the copper in in workshop, so only the final step of assembly happens in the barn.