Agree its past being worth the effort you can get new roof skins from Toyota.I wouldn't say that's necessarily too much rust. As my 62 technically had way more rust than that. The main issue with that particular rust/rot is the location. No one makes replacement panels for those particular areas (you cannot buy them at the dealer - they are no longer available). Those are also very complicated areas with a lot of compound curves and bends and tight angles. It would take a very skilled metal worker a very long amount of time to properly repair all of that.
On the other hand, rotted rocker panels and door bottoms are far easier to repair. The catch is most 60s with rotted rockers and door sills also have rotted frames.
In the snowy states, they rot from the bottom up. Warm coastal states they rot from the top down.