John:
Nice job indeed! I did much the same back in 1996. Working with a 'half basement', my curves are even tighter than yours! All my track is Atlas flex and the turnouts are Old Pullman. Radii of 40", 44" and 47" easily handle my B truck diesels, 0-6-0, 2-8-0 and 40' freight cars. The Philadelphia & Erie is basically a shelf layout, standing on 51" tall 'table top', proving 0 scale can operate almost anywhere and inexpensively as well.
As you know, I also run my larger equipment at the Cherry Valley club.
More pictures!!
Pete Trunk