I can understand the desire to preserve. There's a lot of folks that would say you should never Mame an arcade cabinet either.
But realistically, just getting the parts to restore some of those old radios would be ridiculously expensive and then, what have you got? A beautifully restored AM (or maybe AM/FM) radio that sounds like total crap (cause it's a single paper cone speaker with all of about 8 watts).
Personally, I think you're doing them just as much good by refinishing them, preserving the overall look as much as possible, but upgrading them with better audio, digital capability, internet radio, etc etc.
I'd never think of taking a +working+ radio cab, or even one that didn't work, but was more or less fully intact, and converting it, but the ones I've picked up were shells, no guts at all (except that one still had the crappy speaker, paper, and completely rotted out).
Can't tell from the pics whether these have any guts or not, but, I'm guessing if he got a good price, they're nothing but shells also.