what if i cut a 4" hole one end of each tank leaving all of the original end piece in place, then butt the two tanks together and weld the edges all the way around. i believe the tanks i'm getting have folded ends that are welded, so that would give me plenty of metal to weld. i would also place a
1.5" hole at top so when filling the air between the tanks can escape.would this be ok ??