I mated the corners of beak version 1 to the tarp corners that way, and found I always got a bit of a gap down there at the corner. Seems what is wanted to seal that edge is to get tension on beak corner someways past the corner of the tarp. That might be accomplished though by modding the tarp a little to put in extra tab or D-ring 12 or 18 inches from the corner, along the bottom edge. The corner of the beak could attach to that.
Could the ends be hooked to the d-rings on the bottom of tarp to reduce stakage? It would need some sort of adjustment. Would it work or be worth it? OK ... those are my tech queries.