Very good looking build of this one! I've got one started, and have found the Revell Thunderbolt to be a very accurate donor chassis. In addition to removing trim and filling 'chute depression on rear, I also did a bit of filing/sanding on the body line contours at the front of the fenders. It looks to me that the tooling has been polished a few too many times and has softened some contours that should be a bit more angular. Also, the AMT body seems to be "altered" a little too much. I cut my rear wheel openings out and moved them back about 1/4 inch or so (I'd have to dig it out of the "stalled" pile to see for sure just how much) Compare photos of the real car, and look how close AMT wheel opening comes to the door opening versus the Warbucks car.
Still makes for an impressive display when done as cleanly and carefully as your build. Nicely done.