Thanks for the comment, you are quite correct, essentially the reference to 12mm plasterboard was making the assumption that a thin skim was to be applied later, also please note that with 12mm board, you can also dry line and caulk the gap between the architrave and board, I wanted to make it clear that 9mm board would not be suitable. I hope this clears things up
looks a nice bit of kit, only comment is why allow a 12mm gap for plasterboard when it should be 15mm to allow for 2 - 3mm plaster skim/finish?
Thanks for the comment, you are quite correct, essentially the reference to 12mm plasterboard was making the assumption that a thin skim was to be applied later, also please note that with 12mm board, you can also dry line and caulk the gap between the architrave and board, I wanted to make it clear that 9mm board would not be suitable. I hope this clears things up