Well you got it assembled okay!!!!!!!!!!! Where there is a will, there is a way!!
Yep; I clamped 4X4 offcuts to the posts at the bottom of where the top plate would sit angled for the pitch.
Then I put screw eyes in the posts above the top of the top plate.
I tied rope around each end of the top plate and worked it up one side at a time, taking slack out of the rope as I got each side up until both sides were sitting on the 4X4’s.
I held the top plate in place with a 3-1/2” deck screw while I checked them and got them set correctly. Finally, I drilled and ran a carriage bolt through each 4X4 and top plate intersection except one.
I’ve got one corner which is off by about 3/8” and, when I get back to the farm, I’ll put a ratchet strap across the two top plates, remove the screw and pull them tighter.
Then, clamp and drill the final bolt.