Patch rotted cab or find a better one?

[TwoFiftyShifter]

My '72 has a severly rotted cab. I know that alot of patch panels are available, but do you think it's worth it to yank it off and work on it, or should it absolutely be replaced? I'm on a budget and looking just to make this truck into a driver, and finding a decent cab up here is tough, especially for a low price....
The roof is rotted out, the cab mounts are, floors and cab corners are too.... My Dad will be working on it with me and he seems to think it's way too far gone.