My car has been put on hold for a bit as my computer decided to get a bit sick & I lost pretty much everything on my hard drive!! Oh well lesson learned, MAKE BACK UPS!!! I have started again but alot of my enthusiasm has left on this one.
Anyway, the method that I'm using is using a poly block then splitting up the seperate components of the car. you only need to model one side of the car as they are normally symmetrical. There are loads of ways to make anything, none of them are the correct way. I rekon you should just do it whatever way makes you happy. Hope that helps, take it easy,