If you cut a hole in your polycro groundsheet, is that a problem as a ground sheet? It seems like it shouldn't matter, but I need to ask.
Also, is there any science to cutting this hole? Do I need to worry about the hole spreading? Should I tape it or do anything to keep it clean? Also, how do you keep the sides connected, or do you just let them dangle?
I can definitely see the logic in windshirt with a poncho emergency backup...especially at that weight.