Your biggest problem with restoration would be the roof, its one of the few areas where there are no replacement panels available so new sections would have to be wheeled up to match the existing contours and let in. It looks like most of the outer panels (wings, door skins and bottoms, rear quarters, bonnet , inner wings etc need replacing along with the floors. It is a big job, I know because I'm mid way through rebuilding my 500, but (with the exception of the roof) is within the capability of most enthusiasts, so you should be able to do a large proportion of the work yourself.
If you take it on I would be happy to point you in the right direction for parts and so on, otherwise like I said, I would be interested myself.
If you want to talk through whats involved, give me a call on 07778 766881, would be happy to help