The two side walls and the cross pieces for the roof are in place.
Because we are using white oak all the framing is screwed together (rather than nailed). White oak is a very hard wood.
The strings you see dangling from the up-rights are Pete's plumb lines of sorts. A way for him to 'eye-ball' the angles of the walls.
The pictures below show the progress up to the point you see in the top picture.