Foundation walls complete and most of the floor blocks in. We lifted the beams one with with the digger and the other with a scaffold winch. We did the corner post first but in hindsight should have done the other two first as they where not so critical. The corner post only has compressive strength and flexed as I put the frame up. I had to adjust it after to get it perfectly upright which was the critical bit for installing the bi-folds later on. The corner post is part of the door framing and has a structural post through it. The intention was to have a small corner post and none of the frame visible. The main frame posts are in the wall cavity and are sized to self support the whole roof, although I also tied it in to the brickwork.