(Boeing aircraft have drop downs at the fron of the cabin). Here's my qualm with your system tough, first Baggage Dorms, never going to work, down here we usually fill the entire car with bags, much less having half the car taken up with dorm space. Second, shelves and tile, not a good idea. If you've ever tried to unload/load bags with just the floor its bad enough, much less trying to get the stuff off of shelves. Tile, not a bright idea either, slipping would occur when the car gets icy/wet, the current sysem of a metal floor with holes for draining works pretty well, but lighting is definitely needed. Next, Smoking coaches, not a bright idea either, I know that in the summer time we usually fill all four cars with PAX's by the time we're out of Rocky Mount. My idea for a smoking area, use the unused half of the dorm as your smoking area, and just put the dorm on the bottom with the baggage car (or bag, dorm, coaches, food service, sleepers). Next your numbering system makes very little sense. Here's how it should be:
Baggage 61xxx
Sleepers 62xxx
Deluxe Sleepers 625xx
Lounges 63xxx
Coaches 64xxx
Diners 68xxx
Dorms 69xxx
This numbering system will be more constant with that of the Superliners (that's why the current Viewliner fleet was numbered in the 62xxx series, to be constant with the Superliner fleet of 32xxx).