jeffaroo

I live in the San Joaquin valley, kind of close to your area. I usually make my structures out of 2x2's. Lowes has little brackets just for 2x2's to strengthen the structure. 2'' pvc is to costly when you add up all the fittings.

6 mill clear plastic (Lowes) with some kind of window (flap) to regulate temp.

in the blistering heat I cap the top of the structure with shade cloth. it comes down the sides 4-5 feet from the top. bottom 3-4 feet stay open for fresh air / watering. Misters arnt a bad idea to rig up in it as well

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Keep shoveling on the potash till the ground bleeds