Hatch was leaking and to compound the problem, previous owner of this blue 84 I'm trying to rescue left rags stuf'd in the spare tire well around the tire. I'm thinking to cut the rust-free well from my parts car (hatch also leaked but wise po had removed the drain plug to prevent this from happening, woohoo!) and weld in as replacement. Where is best to cut? Looks easiest to cut donor from top outside of rim and cut rusty one from below the rim. This would give some overlap for support and alignment of workpiece. I haven't removed the tank to see underneath for obstructions but I don't recall ever seeing anything in the way under there when I've dropped tanks before. Also, I see muffler shops welding in the vicinity of the gas tank all the time but wondering if its going to be safe to weld (mig) from the top without dropping the tank. Cutting would be done with air nibbler or wheel. Just trying to save a step or two if possible. Any advice from someone who's done this before?