Level

I adjusted the level of the scaffolding at the front and put in a floor plate, also added one more lateral timber.

The vertical studs are screwed into the backs of the horizontals with a couple of tiny recesses in the front edges to allow clearance for the scaffolding. The studs are morticed into the big cross beam, which rests on the plate at the corner, it is then held down by a smaller plate cut to the same angles. The cross beam has a shaped arch cut into it for the doorway. There is a small backing timber behind the arch facia piece for the wall planks to be nailed into.