Kinda to add onto what cr0sh is saying, when I built my scrap CNC mill a few years back and I know I certainly underestimated the effort required. You spend so much time with CAD and setting the machine up that it's hard to get things done. First time never comes out right. Unless you're making a lot of parts "production" style it's always easier to make the part manually.
$3500 would buy a pretty nice metal lathe and mill. Maybe you can't sculpt a Yoda head but I can accept that.