> I would purchase a full set of prefab plans that suited my needs

Worth saying, asking at a county planner about local permits and standards is really basic. When I was looking at building a carport in my area I asked about permitting at the county office and they gave me the pre-engineered plans for a standard carport, which suits our local soil and weather conditions.

That makes their job easier too if people just use their boiler-plate plan instead of guessing and improvising, then having to have an inspector come out and puzzle out the loads and forces for every randomly built thing.