If there are too many jigs and jogs it looks amateurish to me.
I think I know what you mean. Too many changes in heights or widths = weird. I'm just trying to keep things efficient in size since that duct in the first picture is very low, Barely 6 feet from floor to soffit.
Maybe it's because I'm exhausted. I've been pushing hard in the past week on this project since my family&kids are out of the country until next week. Well, actually it's more like the window closes on Wednesday night as I go to China to joint them on Thursday morning.
Tomorrow is a fresh day. I'll start up with coffee