Great, it seems that the English tying joint with cogs is the way to go - it had not crossed my mind to just lap the rafter over the joint to create the eve, I guess because I hadn't seen it before.

Tim, the space between the last two bents makes up a 12'x24' porch. We want the free span for more open access to that area from the three un-walled sides. The second to last bent is an exterior wall, hence no need for a truss there.