Stop in for a cup of coffee

Butt weld. Thats all im going to do from now on. Lap joint traps moisture unless its 100% sealed inside too. Watched a guy on youtube do 1/4’s on a satellite. Did a nice job and took very little filler after.
You have to be more precise using butt welds. Lap gives you more room for error. IMO. Setting up I mean, cutting the panels to fit....