I can't say I disagree with those three points.
All, let's handshake on the following:
OK:
1. Change color, or change to black-and-white or sepiatone.
2. Obscure or delete tell-tale background elements.
3. Obscure or delete badging and number plates.
Not OK:
1. Replace design elements from one vehicle with those of another (wheels, grille, etc.)
2. Photoshop modifications that change the basic configuration of a car (change a coupe to a roadster; make a Tyrelll P34 a four-wheeled car, etc)
3. Photoshop modifications that place a vehicle in an incorrect time or place.
Agreed?
Meanwhile, here is a selection of Studebaker-inspired cars from other coachbuilders: