Take a deep breath and get a list together. First I would remove that heater and loop it back around. Second since you know the roof or windows leak go ahead and tear ALL of that plywood out and get ready to patch the floor. Make SURE you grind the rust off the floor and at minimum go get prep and etch from Home Depot or if you can find ospho use that to stop the progression. Next you need to address the holes in the floor, I use a welder but if you can’t find one you need to cut out the bad spots and worst case scenario use closed end stainless steel rivers and automotive seam sealer to make patches. Now you are ready for rustoleum primer minimum add on oil based enamel paint after that if you want to go overboard like I will. Next step is stop the leaks. I would sand the roof and Get something like Henry’s tropicool roof coating to seal it off. At this point you will know if the windows are leaking and if they are, pop them out, scrape off adhesive and lay a thick bead of a window sealing compound. After this is complete and dried, attempt to recreate leaks with a hose and continue forward with your build...(insulate your floors etc.) it’s a lot of work but don’t half ass it or you’ll regret it. My two pennies.
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