I worked out a material list for the roof frame.
First, though I changed the bent spacing to
16/8/16
The plan is 26x40
Materials:
lower posts 4@8x8x10
lower braces 8@4x5x5
upper posts 8@7x7x10.5
upper crossbeams 4@6x8x12
purlin plates 2@6x10x40
upper braces 20@4x5x4
rafters 30@3x8x17
total board feet = 2388
multiply by $7 = $16,716
multiply by $9 = $21,492

I like this system, the price is similar to the per join price we've been working with. Thanks for the idea, Rudy.