Stiglr is absolutely right. Just extrapolate.
Don't wait for someone to write a car tut for AC3D or you will maybe wait for years :wink:
The basics are : a polyline or a rectangle --> edge extrusion --> smart edges placements --> edges extrusion --> smart edges placements ...
When the basic shape of the car is done, extrude the windows, etc ...
For AC3D you will have to use the CTRL+E command for edge extrusion, CTRL+T for snapping some vertices together if needed, ...
What I've done so far using the principles of the tut :
Same shape subdivided by 2 :
It's not that hard, it just takes a lot of time.
And I've still a lot of work to do as you can see.