Firstly, it's a good try, it's not a good idea to do a full rebrush of a car at this point in your chopping... career...
I'm just going to be honest. It is unrealistic and toony, Read KTB's post, it has all good info, but I personally don't think you're ready for a fullbrush just yet.
I'm sorry to tell you that, but it's true. the best thing to do is to rebrush parts of a car, not the whole car.
I also fell for the whole rebrush thing, I tried rebrushing cars multiple times with no avail when I was a wee beginner, here is one of my firsts:
http://desmond.imageshack.us/Himg10/scaled.php?server=10&filename=camrye.jpg&res=landing
But don't lose hope! I kept at chopping and brushing small bits here and there! I persisted and I got there. Here is the one and only full brush that I am proud of, it took me 2 and a half weeks and a lot of persistance.
http://desmond.imageshack.us/Himg854/scaled.php?server=854&filename=evom.jpg&res=landing
But yeah, PERSIST, Don't lose hope.