[67c10rustbuket]

Looks pretty good! Maybe try a weld backer or hole plug weld tool like this pic from eastwood. I have one that I mad at work. They are nice and keep you from blowing through the workpiece. Also the copper or aluminum absorbs heat so it helps reduce warpage. You can use a piece of scrap aluminum plate or copper tube flattened out. I use them all the time on sheetmetal.