So, at the end of the second day we had almost a whole room, but with a big gap where the door should be.
On Monday we headed out early back to Whitten Timber and bought a ready cut door frame,
which was actually a bit narrower than the door we had, so the first job was to break out the Festool plunge saw
cut the edges of the door down
and made sure that i fit in the frame.
I then began building up the stud wall to fill the remaining gap
but soon reallised that, due to the aforementioned lack of any right angles in the room, the door frame wasn't straight in relation to the floor that the door would swing open over and so i needed to cut some little chocks to adjust the angle of the frame, and then screw through them into the wall.
Once i had one bit of the frame straight i could then measure and fit the cross pieces (or noggings) of the remaining stud wall,
fix the other pieces of the door frame (and test out the doorway),
and finally cut the final sheet of ply to the right L shape and fix it on.
Then i just had the mammoth and time consuming job of chopping out sections of wood from the door to attach the hinges
and door handles and latch
and the architrave to cut to size with the mitre saw (it's just pinned in place for the moment)
and the door was FINALLY finished, hurrah! A proper room with a functioning door!