It's all about learning new things for me. Plus, I like to have control over what and how things get done. The T Bucket I built was a "kit car" so everyone thinks that's cheating, but I learned a lot and there was still a lot of work. The Mustang was total gut rehab and I did that myself including engine, trans, interior, bodywork and paint. Heck, I was even an "owner" of a couple vehicles and didn't do anything to them except drive 'em.
Now I'm doing bodywork and paint on a friends '55 Thunderbird and they are actually paying me to do it. My current project is a Factory Five '33 hot rod. That's another "kit car", but there is still a lot to do.
My Hot Rod Website