RS4TC ng or sg drawings (4700N, et al)

Does anyone know of a source for drawings of the U.S. Army Transportation Corps RS4TC diesels - either NG or SG?

There were quite a few of these units produced in SG for both the Army and Air Force. At least one was built in NG, well-known among NG fans as the 4700N. From the pictures I have found doing web searches, it would appear that the overall dimensions of the NG version are the same or similar to those of the SG versions. The major difference being a shorter cab and narrowed trucks.

There is some interest in building models of 4700N in 1 1/2" and 2 1/2" scale. Hence the request.