Great, now we need to understand the sizes and spacing.

I have measured your version 8 drawing. I see that the purlins are 4x4's and are 2' on center in the rafter plane but 1' 9 3/4" on center in the run of the rafter. And the unsupported span of 11'. Is that right?

I'll assume it is. And that would give the area each purlin is supporting to be 19.9375 sqft, round up we'll call it 20 sqft.
20 sqft x 40 lbs live load and we'll assume a 10 lbs dead load for the future roofing materials for a combined load of 50 lbs per sqft to be 1000 lbs. (20 x 50 = 1000).

Next we need to understand what type of wood the purlins will be made out of. Your first post says "rock maple". Is that correct?

Jim Rogers