I have experience in maintaining the brakes gears and so one. Appart from that I never actually assemble any of the components. But like you said I am interested in doing it because it sounds like a good and fun experience. I also have several spares from other bike that I throw away.
Regarding the frame, it show some signs of corrosion but nothing that seems major to me to be honest. The brakes seem to be in good condition as well but I will take some pictures and get back to you.
Thank you again,
Bruno