Fick, thats good, we really like the spiral staircase, really, really like it. Ours is a bit of a bodge job, but Snap is in pretty tough times so there stonemason ain't the best...suffers from Pother's Fog.
You should check out the free version of Houdini, seems pretty powerful, even runs on this old laptop, I just use it for fun once and a while.
I also have a bit of the abbey in thrub inwork, and now that I have learned enough (meaning let ruby scripts do the hard stuff) to actually make a go of it in Sketchup and have it look good I will get back to it after Snapgallows and Hebbies.
Really good work, oh, did I say we like the Tell also,,,yup, we do.
SeerBlue and the FHCO's