an A cannot be properly painted with the body on the car; unlike a modern car.
More than likely the paint that is on there will be incompatible with today's modern urethane paints, which wear better than any paint yet invented, meaning all the paint will have to be sandblasted off. Once you begin to remove any paint you are gonna uncover rust-throughs and other damaged areas and the price begins to climb. There are few shops that can do all this type of work properly in such a way it will last as long as what you have now.
If all the fenders, panels, body, etc were off an A right now in our shop, and all were blasted, and repairs properly done; ie the panels and parts were 100% gun ready, we would charge you 5K for a professional shoot and buffing, and that is a very good price, and that is labor only for 3 coats of primer and 3 coats of color. Then it all has to be put back together again.
The pic is small but from what we can see it looks like a decent car. They do not have to be perfect to enjoy them or show them off. Do not be ashamed of something that is not perfect. Enjoy that you have a piece of history and tangible memories of your uncle. Be proud of it and enjoy it and drive it and show it off and have fun; that is what your uncle would want