Jim - keep posting! I'd love to see more of these. I think these working drawings are a 'high art' in their own right.
What was your source material for this image? Roughly what sort of time involved for this base drawing?
In addition, can I ask you a technical question?
(I'm self taught, so I can claim ignorance on many of the finer points of tech illustration
...)
When you are doing a 2 or 3 point perspective like the car you've posted, every object is going to be different due to it's differing location relative to the vanishing points. When it's hand drawn like this, you've got to draw every nut and bolt, so you might as well draw it in correct perspective.
However, when I was reading elsewhere I picked up the impression that it's 'normal' (?) to duplicate some stuff (nuts and bolts for example) if you're working on computer and the object would not be noticeably out of perspective in it's new location (ie: not moved very far). True, or not?