I lowered the height of the floor so that it is more in line with the SW 1500 rear door.
I added a hole and a channel underneath the floor to route the wires from the rear lights to the interior of the locomotive.
I scaled the design up from 1:32 to 1:29 to match the 1:29 SW 1500 design located here: https://www.thingiverse.com/thing:6721897