I spent a fair bit of time clearing up the mess I had made last weekend - there was a lot of plasterboard dust around.
First job was to fill in all of the remaining gaps and edges of the recessed layers. I started by completing the corner alcoves layers. A bit tricky near in this area as I had to slide pieces over the top of the stud top plates. I did these in short lengths and shaved off some paper from the underside of the pieces to allow them to slide into the stud-work gaps easily. The joins were well filled with caulk to ensure there were no gaps. The back right-hand alcove pieces required 115mm circular holes to be cut to allow the ducting to come through. I marked these carefully then used the jigsaw to cut the holes. The two layers lined up well once in place.
There were strips that needed to be inserted into the front and back wall to ceiling corners. I cut full length strips about 50mm wide and these were inserted pretty easily into the gap, pushed up and screwed. Same staggered arrangement as the large strips here and all-in-all went well. This completes the two recessed ceiling layers.
I am going to add at least one wall layer before applying the covering ceiling layer. I made a start on this and managed to get a couple of sheets up on the left-hand wall. Not completely straightforward as I have to cut the 7 degree angle at the top. I am attaching the first layer horizontally and will alternate subsequent layer direction. Anyway the first sheet (lower) went up well it just took a little time to get the angled piece to rest on top. These were screwed onto the stud-work at 200mm pitch. That was it I'm afraid for the weekend - I'm sure I'll get a better run at the drywall next weekend.