Based on the definition of coachbuilder - "a craftsman who makes the bodies of motor vehicles", For Postwar classifications I would consider any non-factory built body that is contracted to another entity to build would be considered a coachbuilt car. Included in this definition would be ANY Henney built model as described in:
http://www.coachbuilt.com/bui/h/henney/henney.htm I would consider this megacool 52 limo to be coachbuilt. I would consider the 53-54 Caribbeans and 51-54 Derhams and 1951 127" wheelbase Dietrichs to be simply modified cars and not coachbuilt cars. If the 55-56 Caribbeans were shipped as convertibles to Ionia (as I think they were) then I would simply call them modified also. I would consider the Packard Monte Carlo, The Balboa, The Predictor, and the Panther-Daytonas to be coachbuilt also. The Request was simply a modified car due to no "integral body shape/structure" changes were made.
Of course this is all just my own opinion but a line needs to be drawn between simply a "modfied" car and a true "coachbuilt" car and this is how I would draw it. Thus to be coachbuilt the actually body of a car needs to be built or rebuilt to a significantly different configuration as produced from the factory production line.
PS I like that Jaguar E-Type Series 3 bonnet too!
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