Playboy is about the only "do-it-yourself" yard that I know of.
They are popular and usually have a waiting list, so you better call and book.
That being said, Riverbend will let you do stuff on your own boat, if they get a slice of the action as well.
Forexample I did haul and bottompaint there last year.
I also contracted them to do fiberglass
work on the keel
Then I was free to do my own cutless bearing, painting and other stuff.
Even if you hire contrators on your own, Riverbend only charge $50.00 per day for it as opposed to the old 20%.
Slow times now so you should be able to wheel