I was thinking about a way to finish the end plate once there is a 1-1/2" hole in it. Here's what I'm thinking. Take a cheapo 1-1/2" chrome exhaust extension for a car. Maybe a turn down style. Weld up some mounting tabs on it and then screw the tabs into the remaining lip on the original baffle plate. So what you would have is a slash cut with a turndown comming out of it. Obviously a straight or slash cut extension would work too!
