Good clip.
DUDE!!!! You are warmer than I am!
As to the plastic.....I use the thin strips of ripple wood to support that ripple plastic. It becomes brittle over the years, and I have WIND, so it needs to be nice and secure so the wind doesn't rip it off and away. The ripple wood strips hold it tightly and perfectly snug, giving it more strength and makes it less likely that it rips right off the screws. Zip ties wouldn't even last the first winter. They would rip right through the sheet. I have never done a temporary installation though.

I like the sketches. In those it looks like you are using the plastic sheets I have drooled over....the double walled ones. They cost more than the ripple sheets. The double walled ones might be stiff enough to work in your design.
the mink/weasels/stoats squish themselves so super tiny AND climb well. Those two traits together, and they can probably find an opening.

I just saw one racing across the road on my drive home yesterday.