Not a lot of plate work discussed here, mostly joinery. Looks like you need an engineer.

I notice how you have the struts landing on the bottom of the king post, while the photo has the struts landing on the tie. The struts are to carry the load to the king then up to the top of the king into the rafters, a cycle, the king is a neutral member, in the drawing, this is good. Having the struts connect directly on the tie is putting the load through the wrong load path. See the king is held up via the rafters. Maybe with the plates things work a little different, there is still shear in the bolts that need to be calculated, and relish around the bolt holes. The engineer will handle that. It is not just the plates that hold things together.

Those 2x4 trusses are engineered.