Need Help with Vinyl Roof Disease on '72 Scamp

It looks like the car is fixable, but not by you.
Under your own admission, you don't have the tools, knowledge, or experience to tackle this repair by yourself.
You have 3 ways to go here, either get the tools and skills to do this job properly, hire someone with experience and pay them to do it, or sell it to someone who has the skills and patience to do the repair so you can cut your losses and look for a better body to start with.
Be honest with yourself and make the decision on what to do from here.
As posted previously, it isn't that difficult really to repair and replace the roof skin and other rusty areas, however, for a first timer it could be very difficult and overwhelming.
Another point that nobody has mentioned yet, is that the roof skin and body as a whole is a major structure that works together as a unit and makes the car strong and safe to drive.

Whatever you do, DON'T just seal the holes with bondo and foam etc. just so it looks better and think it is safe.
It isn't.

This happened to me about 10 years ago.
I had a nice 99% rust free '70 Dart 4 door.
I was driving at about 60 mph and hit some black ice and barrel rolled the car twice in the ditch.
The windshield popped out, but the rest of the glass stayed in. The roof was crunched in here and there, but not badly.
I was wearing the factory lap belt and was unhurt other than a small cut on my face from the glass.
The car was driveable after this and in fact i drove it about 80 miles home in the middle of winter no less.

If i was driving a 2 door hard top with a rotted roof and did the same thing, i doubt that would have survived the crash at all, and wouldn't of course be typing this.

Food for thought.............