[Porsche-O-Phile]

I doubt you'd need an architect's or structural engineer's stamp on drawings for something that simple. That sounds like it's a very basic, over-the-counter type permit that (at most) would require some basic calculations to show that the framing members are large enough for anticipated loads (including snow loads for your area which may apply - check your codes). In any case, it's something that shouldn't take very long to put together to the satisfaction of the building department official taking your application.

If I were doing the design (I'm not) one thing I'd add to your schematic is some sort of provision for lateral loading - either shear panels or cross-bracing, or showing moment connections that can withstand anticipated lateral forces (select the correct Simpson connector). I'd recommend footings as well (thickened slab in the areas where the posts come down should suffice for something this light).

Another consideration you alluded to above was water - show a minimum of 1/4" per 1'-0" slope on the roof to drain - either sheet drain or with gutter & downspout. Some municipalities require you to show that downspout discharge will ultimately end up in a catch basin or other collector on YOUR property (i.e. you can't have it discharge and sheet drain onto an adjacent property or public right-of-way, you need your own drain and to show how this will be accomplished). Again, simple phone call type stuff.

Other than that, this is pretty straightforward. You've got the right idea with the factors to be considered (live & dead loads, wind, water & snow loads).

One other thing I'd consider - posts "C" and "D" (especially "D") look rather vulnerable to getting "clipped" by someone with a car if they're not paying attention. I'd suggest a bollard or some other mechanism of protection (stone wall, berm, whatever) so that if someone comes home tired some night and accidentally bonks a column, they don't collapse the structure and kill someone.