Nothing wrong with quantity but position of a couple means you have nothing to fix plasterboard too in the internal corners .
Any suggestion on how to better position all studs to have a fixing point on the corner?
Nothing wrong with quantity but position of a couple means you have nothing to fix plasterboard too in the internal corners .
Just need to move the one marked at 257 to left corner slightly and similarly the lower corner as they need to be at the end of the boards.
Generally no need to use treated timbers on interior framing work. Standard CLS (as opposed to the slightly stiffer structural C16 grade) is more than sufficient for stud walling providing it isn't a structural (load bearing) stud wall. Timber yards are generally a far better bet than DIY sheds in terms of both quality and price in my experience. In other words you are spending more than you need to