When I was looking for a cnc setup, I did alot of researching. From what I read a taig along with Mach2 software would be a wise chose. The best price on a taig ready to go was from
here . You can buy Mach2 software elseware and you are ready to go. The Taig does have it's limitations, like teilhardo said, but to do a chasis I'm sure you can play aound with the mill and make one up in two parts, first you do the front end then the back. It will just take some figuring on your part to get the programming lined up. But once you figure it out you will be in business. The only reason I didn't end up with a Taig is that I ended up having a bigger budget than I thought I would. I ended up ordering a shoptask for 3x's the money. I'm sure the Taig should suffice for your purposes.