Nice, but it would have been way better if you'd shown the construction of the angled panel. I think anyone can work out how to do square walls but I'd like to have seen how you laid out the angled cuts.
Definitely not a joiner or a chippy. Double stud should have been on the outside corner to carry the plasterboard, and allows the other end to fix to the wall through one stud, not two. Also, the noggins are normally fixed at the same level using a gauge staff. Just sayin, having done this for 30 years....
As a spark, I actually preferred the noggins set at 1.2m. Run the circular saw down them and notch away 10-15mm for your 25mm metal switch boxes. I find that quick and easy. congrats on 10k subs very well deserved! :)
