I'll say this, the roll up side make all the difference in keeping things cool and air moving, even just rolling them up 1foot to let some air flow. I'll be adding some kind of screen this year as I continued to get the dreaded hornworm moth laying eggs on my tomatoes. The screen will stop that but still let the air in.
First year I didn't have a shade cloth it was unbearable to go in there at high noon in the summer, even with fans blowing and sides rolled up. It was like you were an ant under a magnifying glass in the hot sun. Got a shade cloth and can now stay in there all day long. I think it's a 40% which was purchased from Greenhouse mega store. Still lets plenty of light in and things grow like crazy, it just doesn't get overwhelmingly hot.
Check out buildmyowngreenhouse .com, as they sell the hoop bender you will need. That's where I got mine. Plenty of examples of what can be done with a build you own after you bend the hoops.
Also, check out FarmTek's steals and deals section for misc parts. I go a 30X30 louver for 30$ that I then modified added a autovent arm to. They also have leftover greenhouse film you can get in odd sizes. Sometimes you score and cen get the endwall and roll up side pieces for very cheap money.