I agree about the venting.
If you can spend just a little money, a pvc quonset hoophouse is a tried and true design. I would trust that more than anything made by Harbor Freight. If it were me, I would buy at least the 1-year greenhouse poly film, and then take it off when the short season was over. 1-year film would last you several years this way.
I don't have good luck with duct tape. I like vinyl tape better, and I like the clear greenhouse poly tape the best. You can make clamps out of small sections of pvc cut in half longways, then screw or bolt it to a pipe to hold the plastic. Wiggle Wire is another option if you can spend the cash; it makes it easy to take plastic on and off.
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