I can see a lot of progressions since your first post
I think restarting the McLaren was a good idea because, cleaning it up would probably have taken you longer :eeek2:
I think you're working quicker when you start with basic shapes to then refine afterwards. So, i would say it's one of the approaches you should use :nod:
Try to get as many reference as you can. They are very helpful when you need to model areas/sections that are unseen in blue prints :nod:
Keep in mind to keep it low when working with polygons, because you will eventually smooth the whole thing afterwards.
Try to keep it all Quads instead of Tris (where you can) and absolutely NO N-gons (this will give you unwanted result when you clean-up or smooth)
Anyway, hope this helps...
and Keep it up my friend!