thats nothing for rust mine was much worse
heres some pics
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as you can see it was a horrid cancerous issue and i hated it didnt take time to tack cool tack but thats how it should be done results will be much better.
but youll need some sheetmetal and a vice and hf body hammer set with a few flathead screwdrivers and some vicegrips. use mics tools to bend and shape metal to the area. then cut out the area trace outside the new piece that fully covers the rusted area by 1 inch. then cut just inside the line and your new piece will fall right in. anything overlapping or butting vice grips help to hold it. if you have a hole (burn through) jb weld a old penny or piece of copper to a stick and put it under the hole then try to weld it to the metal. the steel wire wont weld to the copper. also tack every 5 inches then go back and tack in between, then tack just after each tack allowing it to cool. this tequnique will give amazing results