Oooo! I have definite train-room envy. 
That is going to be a very nice space.
WRT track-planning, I especially like the three-stub-siding industrial area (lower right). I have done this on my pike and it provides very interesting switching operations. Sort of an abbreviated Inglenooks switching puzzle. I find an Inglenooks to be much more realistic and prototypical than switchback-timesaver puzzles:
Depending on what is incoming and what is outgoing this four-industry area can take 40 minutes (actual, not scale time) to do the switching.
Lew
