Here is the latest update. I eliminated one of the mains and accomplished my goal of leaving more distance between the outer main and the walls. Should also provide some opportunity for facade structures in several areas to add more depth and interest. I changed the hidden storage yard to begin at the top of the loop. I was losing a lot of yard track by bringing trains fully around the curve before entering the yard.
Lower level hidden staging yard and reverse loop
Main and upper levels
I've also included PDF's for those who don't have RRTrack. Please don't hesitate to offer suggestions or critiques.
Steve