A bit more cutting out with the stelsaw was needed for the damp proof membrane around the sides of the window.
That stelsaw is made by... Husquavarna. Seriously. So I have had a brand new Husquavarna working in my sewing room! It also makes a good job of cutting the super-hard Staffordshire Blues. Though I don't think it would be much good for stitching.
The bricks and internal blocks are held in place with metal ties, up the sides of the brick & block panels. These were cut to size with a hacksaw, before being screwed on either side of the existing wall cavity.
Takenoko doesn't know what to make of all this.
Bernard mixed all the dabo by hand (every time he says "dah-boh", I think of Japanese fabric company Daiwabo