WOW! That's B-E-A-U-T-I-F-U-L!!!
You can use many of the posts on the forums to figure out how to do a restoration - I'm sure many of the components are the same or similar to 50's Airstreams. As far as costs...the linked below website has a lot of good info & resources.
The thing is - these restorations always cost more than you think they will, it's like peeling an onion...the more you peel, the juicier it gets. It would depend alot on how structurally sound the floor & frame are. If in good shape, you can just focus on aesthetics - if bad, you may have to take it down to the frame like we did (and many others on this forum) on our '56 Safari
. That can cost upwards of $20K.
It'll be a total GEM when you are done...