After reading the poncho tarp thread I've been thinking of sewing a poncho tarp that could be used as a tarp door this winter. I'm not ready to try to use a poncho as a primary shelter, but it could be a nice shelter supplement. It could also be used to cook under if your primary tarp was pitched low in anticipation of foul weather.

I was thinking the top middle would hook to the apex of the tarp, the top two corners would tie out to the top middle via shock cord. The two bottom corners and bottom side get tied out to the ground.

Has anyone tried this or see any reasons why it wouldn't work?