That's a good idea. The whole thing is mostly blocked from the wind by our garage so we'd probably only have to do that to one side. Easy enough. Thanks for the tip!
What we did to cover the floor ramp opening was put a piece of plywood at night across the opening on very windy or stormy evenings. Of course, now that we've permanently closed the opening from the Silkies, the plywood stays over the hole all the time so their only access is through the outside wall pop-door.