So what we are going to do is link all of the factory welds and tie the whole thing together.
I thought this was going to be easy, but nooooo. It seems that a 40 year old lap joint is nigh impossible to clean. I sandblasted it. I wire brushed it. I sprayed solvent in there and blew it around with a blow-gun. I heated the joint with a torch to burn off contaminants but my welds were just looking like rubbish. This thread catalogs me figuring out the problem with the help of Jake and Matt...
http://www.pro-touring.com/forum/showthread.php?t=46863
So with the problem solved the welds came out pretty well. You can see the factory lap weld above my weld in this picture. It looks like they were stick welding these things and doing so very quickly.
Now remember, these are flux-core welds on a dirty, 40 year old lap joint. My torch technique is as you can see "rusty" to say the least. But, the welds are super solid and fully penetrated.