Hi: The purpose of the layout is to run a single train. The sidings are a for industry and a passenger station. The tracks on the far let will be the engine depot for my Erie Triplex and N&W 611. Also one track for the work train.
The curves must be 072 as that is minimum radius for the two about mentioned engines.
You are right about access hole, gotta have one. All engine storage will be on the lower level of the layout. Car storage will be off the layout so I can make up a different train each time I run.
All input is appreciated. I have been out of this for 55 years, jumping back in at 70.