'66 Convertible Floor, Torque Box, & Rocker Question

I have a '66 convertible that I recently started storing on a lift. I noticed that when on the lift, the doors were hard to open and close. When the car is on the wheels the doors work okay. I suspect that the pans, torque boxes, and rocker panels are rusted to the point that they are letting the car sag (or rise) in the middle. I have several questions: 1. Is this a job that I want to undertake (I have a good shop but I'm 68 years old with bad legs)? 2. Should it be done with the wheels on the ground? 3. Is there anywhere out there that still has original Ford sheet metal? and 4. If I have it done, what is a reasonable price for the job? Thanks
 
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car is probably fine

Your car is probably fine. Most mustangs flex especially convertibles. The time when it is a problem is when it is on the wheels and door gap closes at top to rear quarter, that's when rockers are going bad