Aaron,
What would you think about putting the TT area on top of the mountain? it would trade the lower level yard space for more buildings and such. The run to the top is a 3.4% slope.
Better position of the TT would switch the longer whiskers to the top and permit the roundhouse doors to be facing front.
The inner loop could be tied to the straight with switches to create two reversing loops.
Then, add some crossover pairs between the inner and outer loops.
This eliminates a third line, but, it provides more running options and three trains could be run DCS only.
