You are most welcome and feel free to post any questions or ideas you might have. One thing you will find out or are finding out is that many of these tasks are so much easier with the right equipment. As it relates to welding, its mostly about the power but also about the shielding gas flow and the ground. I am not sure what size wire you are using, but I prefer .023 for sheet metal. I know some people prefer .035 but IMO it leaves too much to grind off.
something that might also help you is to used something like this
https://www.ebay.com/p/VIM-Products-MPWT-Magnetic-Plug-Weld-Tool/1623776290?iid=202262477076&chn=ps There are copper plates that have magnets embedded into them but I find that they don't work all that well. The item I listed the link to holds well but you have to move it around a lot. You could try the plates behind the welds and use another magnet to hold in place. The point here is that the copper plate draws some of the heat out of the weld/panel plus weld will not stick to it so if the wire goes through it has something to hit. Because the plate takes some of the heat, you tend not to burn through as much. Lastly, it gives you a decent weld or seam on the back side (side against the plate).
There are lots of these types of things for sale online and you can even make some if you like. Search around the internet before you buy, the item I posted the link to is sold by Eastwood for $45 and its on Ebay for $25.
