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As long as the rust hasn't gotten to the frame, you can probably fix this a whole bunch of different ways...
For the most "dependable" fix (in my opinion), I'd probably want to weld several pieces of reinforcing members across the biggest holes, then weld my layer of sheet metal down. Try to cut away as much of the rust as possible, paint anything that can't be cut away. (Autozone has an interesting spray-on product that supposedly turns rust to primer.) Spray plenty of undercoat all over everything.
Don't be intimidated by welding... for example, the learning curve on a MIG/flux welder is ridiculously small... after 10 minutes of practicing on scrap, most people are ready to begin welding (not the greatest looking welds, but structurally sound). You can get a cheap wire-feed welder for around $200 at any Home Depot, Sears, etc. They also have the advantage of being able to plug into an ordinary wall outlet. Some people compare wire-feed welders to using a large glue gun... there honestly isn't much to it. Plus, you can use filler wire thats designed for welding on rusty/flaky steel.
If you do deside to take the welding approach, be aware of anything flammable (fuel lines, etc) within a 20' radius. Plenty of heat and sparks will be generated, so be careful!
The sheet-metal screw approach will also probably work... make sure to seal every gap with silicone sealant (or similiar).
Hope this helps!
12AX7
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