Old Car Projects
OldCarProjects.com would make a good domain for a car restoration forum. I can imagine a place where guys who like to do these things gather to share tips, resources, stores etc.
Since I don’t do this kind of stuff myself it’s hard for me to think of content that isn’t already being done elsewhere. I do have an old window glass interchange manual that might make some useful content. It’s copyright 1947 so it includes lots of old cars.