by mlrr
**Update**
I finally figured out what is making the IMW higher than they are supposed to be.
Drum roll please.............................
THE PROBLEM IS IN THE CORRUGATED SIDES!
If you compare photos of the prototype to the models, you'll note that where the corrugated sections are (there are two on each side) they are a bit "thicker" than they're supposed to be.
http://www.flickr.com/photos/mark_vogel ... /lightbox/ (right click and "open in new window")

Note in the photo of my model how there is significant overhang of the corrugated panels with respect to the "METRA" placard. This is the cause of the 1/4 height difference between the profile of a Walthers Superliner and the IMW Gallery car asside from the chassis which had to be bent (not hard, just needs to be heated in the oven and straightened, then the ends sanded down to remove the extra resin). At least I know I can rest easy knowing what the problem is.
I finally figured out what is making the IMW higher than they are supposed to be.
Drum roll please.............................
THE PROBLEM IS IN THE CORRUGATED SIDES!
If you compare photos of the prototype to the models, you'll note that where the corrugated sections are (there are two on each side) they are a bit "thicker" than they're supposed to be.
http://www.flickr.com/photos/mark_vogel ... /lightbox/ (right click and "open in new window")

Note in the photo of my model how there is significant overhang of the corrugated panels with respect to the "METRA" placard. This is the cause of the 1/4 height difference between the profile of a Walthers Superliner and the IMW Gallery car asside from the chassis which had to be bent (not hard, just needs to be heated in the oven and straightened, then the ends sanded down to remove the extra resin). At least I know I can rest easy knowing what the problem is.