mo -

while it will be a creative roof to get the plan and center pin to work, what i like about the 2 truss concept is that it really helps lessen the outward thrust on the corners. not something that can't be solved - but it is an elegant solution and will probably allow you to keep wood to wood joinery in all cases and not have to go with some hidden tension steel in the corners (or really long bypassing tenons - that could pose tricky.

the other nice thing about the 2 trusses is you have the option to get some bracing to a ridge to stiffen the roof laterally along its length. certainly a hipped roof triangulates along itself - but i've experience hipped roofs being a bit jiggly until the sheathing gets applied. adding a few braces can't hurt.

good luck, and my offer still stands. send me an email if you want me to take a peak at some sketches or want to see something dropped into sketchup or hsb.

-mike