[Joe Bob]

The rust under the battery can attack more than one area....the suspension console, where the swing arm connects to the frame, is only one area....the longitudinal support under the passenger door is one...

Typically the jack point will break and fall out, then the door gets hard to close because of body sag.

Other rot points are the bulkhead between the engine and passenger compartment and the floors.

"I" would do a thorough inspection of the car and then decide. If the rust is not too bad, get some POR 15, treat the rust, do the welding and go on....

Unless the car has minimal rust and you are a good weleder, the repairs can very easily exceed the worth of the car....stripping the good stuff and putting it on a good solid 1.7 car can be done in a couple of weekends...