First you have to realize where I live
There really is no "Code" ... They don't care how you build it, only WHERE you build it.
I just got back from the building Dept., I'm on hold untill they figure out what my zoning is and what my set back's need to be.
I did look into Trusses but they are Waaaay expensive here because they have to trucked in from over 100 miles away... and I'm on tight budget.
We do get snow here, I'm at 7,000 Ft. elivation, We rarly get more than 6" at a time here in the valley and it usually only lasts two or three days.
I don't want a slab floor because I work in there all day and slab floors are hard on my feet and back, And they are Cold!
The total length of each rafter will be about 11 1/2 feet. with a ridge board.
So for now I just wait ... There is no "Building" engineer around here.