Another ductwork job next week possibly. Have to go measure it all up tomorrow. I thoroughly enjoy getting rid of ductboard. Been over a year since I have used ductboard for anything. Only reason we did was to match the unit sitting next to it. They wanted them to look the same, or as close as we could come to the same.
Custom fittings is the way to go. Got a zoned system to finish tomorrow possibly. Try and snap some pics.