I understand the sentimental attachment you have for the car, so simple fix it.
You can get fiberglass or steel front fenders. The floor aren't really that bad so you can patch or buy the 1/4 floors. Interior can be pick up used in the wanted section on here, or watch for guys posting for sale.
If you don't have a welder or a friend that welds, pick up a gasless Mig welder there cheap and either take a course, watch videos an practice before you start.
I had a 86 olds Cutlass Brougham in 86 well short story it died. But l bought a 86 again 2 years ago, replaced floors, drivers side of trunk along with inner wheel well , fenders, doors, engine(built 468), transmission(built 4l60e), rearend(8.8) and removed vinyl roof an fixed rust, body work and paint and pretty much broke even with the appraisal value.
Point is it can be done and done within reason if your willing to be patient, shop and learn.