Moonman, Thank you, the picture is what I really needed. I'm locked in with 9" shelfs along the straight walls. The shelf along the 65" wall sticks out 28" at this time, I plan on cutting it back once I get the track in place. I only have 42" curves at this time, is there any way to make them work, maybe adding some short straights ? If I really need 54" curves there is a train show coming up next month in Jacksonville ( or maybe some forum members may have some they would part with ) . The 2-1/2" clearance on corners will work even 2" measured from the rail.
Doug