Well, I'm sorry to hear you had to re-start, though from looking at your wireframes. You didn't actually have an unmanageable amount of geometry.
In fact, I can see there is an ideal surface area for modeling wheel arches, where you would want them.
Anyway, good look with your project.
And remember... Don't give up on a project every time you hit a speed bump (no pun intended)
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
[long pause] "Friend!!"