I also am looking at this from the point of view of a guy who is scratch building a model (very slowly though...).
So far, I have made the chassis out of sheet styrene and extruded styrene sections bonded together for the chassis and have been making suspension components out of styrene rod and tubes.
The body was mastered from a die cast copy but it will need massive re-shaping to get it from the current state (a MK2 body) to the one I need (a MK1 version).
As I said, I would consider that a scratch built model but I would hardly call it engineering.
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