Thanks guys for the comments...
After a bit of time to think about it, I've noticed a few things that are really bugging me.
My rust patterns are too symmetrical especially around the bottom of the ribs (looks like
The same pattern over and over) also some of my rust streaks are not vertical or they curve...
I'm missing texture, I'm not quite sure how to achieve convincing texture in N, anyone have any
suggestions?
The wash I used to fade the car didn't work. The gray turned out much better but (as CoalPorter pointed out) the black was unaffected.
However I am happy with my progress (my first car with tube paints will not be mentioned :-[)
And since this car was for practice and has about a snowballs chance of being in my roster I will probably strip the car down and try some other techniques on it...
Scottbird, I used a number of brushes mostly a 10/0 blotter and a 1/8 angled brush and drybrushed the lines...
Cheers
Ryan