Dave,
One idea I have is to cut wedges, or V's in the cloth. That way when you close those gaps you get a curve. I may get some kinks and to be honest, I'm not worried as much about the cosmetic of it. That in mind, do you think those kinks would affect water flow adversely? Appreciate your input. I'm the guy who figures out how to do something but using 17 extra steps...
Moose