You could try the raffia grass on two sides of the hole meeting in the middle. Basically a North side of raffia and a south side of raffia. That way the kids and new sports are hidden and dont have to shove the pit lids when they shoot. I dont like the idea, because when it snows and pours, your pit is becomes muddy. Cheap and effective though.
Although, I have killed with the pit lids just open.
DUCK HUNTING ITS NOT ABOUT THE BAG ITS ABOUT GETTING AWAY