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It took all day but I got the greenhouse covered. After screwing around trying to hang plastic vertically I decided to tip it over so the side I was working on faced up.
I used vinyl siding under sill trim to hold down the plastic and spread out the clamping force. I picked that because it was the cheapest piece of plastic I could find in 10ft lengths. It didn't cinch down along its length like I had hoped so I had to use extra screws. For some of the pieces I cut off the nail strip to use at the mid point of the panels to cut down on billow flapping. I ran out so I need to get one more piece tomorrow.
Just a few finishing touches. Trim the ventilation flap and add clips so it can be locked open or closed. And install the door which will roll up like the vent flap.