Don,
The most glaring issue is the hood width. The model is much too wide...which causes the cab window and door widths to be incorrect.
I asked RY and he couldn't explain it because the motors and electronics (2 rail) would fit in a scale width hood. There are also several minor issues which can be identified by studying photos of the prototype loco or descriptions in back issues of MR and Extra 2200 South.
On the plus side, these models are a vast improvement on the Lionel "44 ton" loco.