Thane - I think the posts should move closer to the corners, and the plates will need to go up in size. Those braces need to get out near the corners. Lots of shear going on in those plates that are cantilevered. That corner joint will be interesting!


I would definitely get an engineer involved when the client says 'Go'.

Shear plane in the roof will help hold things together - but if there are no walls, uplift will still be a concern.

Another option would be to add a center post on each wall and make your trusses span from center to center (getting them into the plane of the roof and out of the corners). Then your truss bearing locations will be over posts, and your hips will drop into corners. With this method the corners only need to hold up the end of the hips (and their distributed load).