The ceiling backer boxes are in. They were a pain to get into the front of the room just in front of the LVL beam. Some brainiac thought it would be a good idea to spray foam that entire area.... I got to spend some quality time scraping away with a putty knife. Fred Style. grin

The other issue that made it difficult was the floor joist are 7 5/8" and the boxes are 6" deep. Not a big deal until fiberglass batts are crammed behind them. Pretty tight fit, but doable. I used utility banding as a temp support until the channel is up. Only lost one knuckle on the screws poking from above. wink

The result x 4