My Command & Control for Ross turnouts has always been Tortoise 12VDC motors and on/on toggles[replaced ASCs].
Walt: It seems to me that you will have plenty of space to install really wide mainline curve arcs--096, etc.
If possible try to plan the location of switches, accessories and railpower connections so you can rough wire as much as possible prior to covering up the benchwork grid. It will really save a lot of under layout work later. Use small T-strips where your planned wire runs terminate which will provide for easy, quick hook up after the track, switches,accessories,etc are placed.
Good luck?