This has to be the finest example of this model extant. I had a lot of fun with this one as a high school student but would love to take another crack at it as an adult. No doubt my efforts would pale in comparison to your own.
Harry, best wishes with your treatment and recovery. The Rolls llooks great so far. I built one of these as a high school student. It was by far my most challenging but enjoyable build up to that point in my life. I'll follow along with interest.
My point is any "rattle-can" spray will come out better than brushing. Your best choice would be to use some spray primer and top coat withe your choice of color. I take that back. Your best choice is to have fun building it!
I have built this kit several times and consider it a milestone model. I agree with everything that has been written so far. My friendly advice would be to at least buy a Testors spray can of flat black for the chassis and a can of spray gloss white and use it for the white parts of the body and top. You'll get a much more satisfying finish that way. I'll be watching with interest. Welcome to the hobby!