I'd like to update you on progress so far. I've decided on a scenery plan, mountain area, main city area, freight yards, etc. on the main layout of 8' x 25'. I designed the plan around the main track line using 0072 curves with 063 inside curves. In order to utilize the Korber engine house ( built for my prior layout 8 years ago), the GGD coaling tower, and the Atlas two bay engine barn, along with other accessories, I've decided to add an 8 x 8 addition creating an "L" shape at one end of the table. The 8 x 8 addition will for the most part house the buildings noted and several side tracks for storing engines.
I ordered additional Gargraves curved track today to finish up the two main lines. I haven't yet figured out how to include the two bridges from the last layout. When I install the new track, I'll post a picture of the layout. Thanks again for your helpful suggestions!