How rusty is too rusty??? Caution, rusty photos attached

[Onebean]

I'm on the hunt for a 71 or 72 Chevy pickup. LWB 2 wheel drive with a decent body I can tinker with and drive for fun. I found a pretty decent non running truck, but the cab rust is much worse than I hoped. The rust is up onto the kick panels, the rockers and cab corners are real bad, and the floor has complete rust through where it meets the rockers. In spots a baseball might fall through. At what point is the rust beyond normal repair? I'm not a body man, and I'm not confident in my ability to repair that much rust. It would have to go to a body shop. Take a look at these pictures and let me know your thoughts.

Onebean