I think I've found a set of plans that I can mod for my tailor's shop... an SCA gallery pavillion.
http://www.mastercharlesoakley.com/shade.html Theirs is 8' x 6', but I can adjust the size to make it a little larger, say 8'x8'... and I could make the low curtain rods go in either front or the sides, depending on how I want it set up for the day. I am thinking side curtains would help prevent people from walking in from the sides, yet it will allow for nice breezes only being a few feet tall. Oh, I see they have a tall side curtain on one side in the drawing. Hmmm...
Check out
the rest of the site, as there are a variety of plans for everything from trestle tables to German folding chairs.