I have spent the past couple of days framing in the ductwork along the ceiling. The original plan, last year was to relocate all the ducts to the side wall so we would have the full height ceiling but when I found out that the price tag on that event would be several thousand, that quickly dropped off the scope of work. So now I am enclosing with some G1S ply so that I can get a bit more height under the ducts and it is a bit more durable than drywall. Of course as I was going along putting up the 2 x 2s I found the place where the former owners had hacked out a section of the main duct run, because, well, I guess because they could... Maybe it was the supply to the sauna which they later covered up because there were no registers in the sauna before I took it out. No matter, I had some sheet metal left over from the first patch job I did (which incidentally increased the amount of heat we got in the Master bedroom), so I just bent it up and used some self tapping screws to fix it in place. Then I taped the seams with some of that metal duct tape. BTW, the traditional "duct tape" is good for everything but ducts. It dries out so that makes it useless for patching ducts. Who would have guessed? The next task is to get the plywood cut and secured into place.