Leave an edge on the base that is 1/4-3/8, then roll it up, you will get a good lap weld. Even if you only leave the straight sides, it gives you some sort of edge to weld to. Tim

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!