Tony,
Lots of folks have looked at your post but I will gladly take a few moments to offer some pointers.
Where to start? You will need a place to disassemble the doors,heater and such.
Get some ziplock bags,a sharpe ,and a camera.
Take notes, ask questions. Get a good angle grinder and wire wheel. Clean up and remove all the bad areas. If you have some welding skills and can make a pattern from cardboard to replace the rotten stuff. You can't hurt anything,just go slow and brace up anything that will settle.Get a gallon of rust cutter from tractor supply and coat everything.
