Oh my gawd, that is soooooooooooooooo cool!
Since the focus here on Fiberglassrv is about molded fiberglass travel trailers, I am not sure you will find a lot of help on certain project issues you may face. So I will recommend googleing, vintage pop up, restoring a vintage travel trailer, Range pop up, etc. You might find more help and suggestions. Good luck!
Here is a link I found just googleing, restoring vintage pop up. http://zoomcart.com/members/restoration/polishing.html
and I found this one as well. (love google! ) http://repairingyesterdaystrailers.yuku.com/directory
This is a forum with lot's of sub-forums that might help you out better than some of us can........
Welcome to fiberglassrv, glad you joined us! Have fun with that project, it will be worth it in the end. Good Luck!