This room is 8m x 3m. I am going to put a dividing wall across the room incorporating four antique chinese screens, to make two rooms, the one down that end will be 3m x 3m and it will be the bathroom, this end will be the bedroom and end up 5m x 3m.

So this little project will be the width of the doors, x4 plus 5 thicknesses of the frame, equally spaced between the two walls.

Notice how P****d the ceiling is, sloping down to the right, well the floor is not much better, the floor rises up hill slightly towards the french doors. I did mention earlier that it was a basic flat roof extension, the builders who built it couldn't have owned a level.

I like to scribe things in, so when I put my frame in, level and plumb, I'll need to scribe to the ceiling and the floor.