Then I started from the other end of the strip and finished the tube.
I used a 2" hole saw to cut a groove about 3/8" deep in a piece of 3/4" plywood. The tube on the left is in the groove, the one on the right is setting on the board.
I used 4 spot welds on the long side and 2 on the short side.
The outlet tube is a snug fit to the hole.
I like it.
I like the more rounded corners.
I think the baffle will do the job of give the air a little more heating as it move to the outlet.
Now I need to weld them to the manifolds.