Thanks, man! Wow... almost forgot about this thread...
All of the work above was Illustrator (starting with pencil sketches on paper). Speaking of pencil sketches, if you'd like, I created and posted a tutorial on drawing here on my site: Tutorial: How to draw a hot rod
The upcoming tutorials will get more into the digital side of things. (they'll all be part of my book)
A few more recent ones, if interested:
'55 Chevy (you may have seen this in Popular Hot Rodding, or not...):
...top chopped, car in progress:
'56 Chevy and interior: