Met with our third architect, and our structural engineer; seems like our yurt plans are looking good. Our next consideration is how difficult it would be to go up a 4 ft diameter stair (very tight spiral necessitated by existing beams and columns).
I think we are going for the 16 ft. version, as referenced in the above link.
{Personal}
Four foot stair is very tight; even though 4-6 won't really fit through our rafters, we are attempting this instead.