How much rust is too much?

Hey guys:

I've been thinking about what to do with my Duster. It's a 1975 Custom with AC, V8, A904 LBP power discs and 8-1/4. It has all the trim in good shape, plus dual chrome mirrors and inside hood release.

It also has definite body issues. It's a great 20-footer, but up close you see the problems. It has rust in both quarters(expected) both floors, and across the entire trunk floor. It also has rust through underneath the lower windshield trim, at the A-pillar/roof joints and around a non-factory sunroof.

The driver door striker is breaking through, and both rear upper shock mounts have rusted through and been repaired. If that isn't enough, someone cut out the cross bracing behind the seat to install speakers!

In contrast, the chassis is great and the doors, fenders trunk and hood are fine. It has all the stickers, tags and the broadcast sheet.

I like the car and I know it would be pretty with everything repaired. On the other hand I have seen many cheap Dusters/Dart Sports with less rust and I could use all my good parts on one.

On the OTHER hand there goes the originality.

I know what my gut is telling me to do, but I'm not convinced either way yet.

So, I'm going to poll it. Please, no "it's your car you can do what you want" or whatnot. I simply would like simple "yes I would fix it all regardless of the cost" or "there's too much wrong with it, part it and build a solid car instead".

Thanks!