Good work Jeff. Another way to clean up the rust areas under the bonnet skin where you removed the section is to blast it outside with a hand held garnet gun. You end up covered in garnet but it removes all the rust and you can then hit it with zinc gal. To reduce warpage when you are doing large flat sections, just do it one tack at a time and move around the patch using an air gun to cool it down, it looked like you had run a bead along the join, it should be a series of spots. I would recommend James at MIA for engines, but it wouldn't be home built then!