Wow, thats pretty intense! I wish i had enough space on my layout to park my locomotives around like that! I also wish i had more six axle units. I keep buying them, (E60MA.E60C-2, SD45-2, C32-8, and an SD60I being the latest) but i always end up with more 4 axle power. I've got 4 GP15-1s sitting around my layout right now. (three smokey valley, one walthers).
I model the modern era, and i have almost no widecabs! I've got 4 i think, not counting my old UP dash-9, which is a wreck. Thats out of a roster of 56.
Then again, right now my layout is so small that baby geeps are about the only thing that looks right on it!
so keep up the good work, it looks like this layout will be impressive.