On the 72" radius requirement - it really would be senseless to put compromises into a $5000 model just so it could go around a 65" curve. Almost all of my larger steam requires at least 70" radius, and I am not above tapering the tailbeams and lengthening lead trucks. Discerning modelers won't put up with that.
I am surprised Lee could get it down to 72". My Daylights protest on 74".