Well, mitto and others, I found that when I used the cover without the holes it did protect it better, but it also collected loose material from the ground when I scuffed the area, in mulch or leafy areas some debris would collect in the area between the coil and cover where if cut out would just fall back on the ground. I am thinking of making a template using mdf board of each of my coils and then I could use either a router or rotozip or other rotary tool with a template follower bit, even a veneer trimmer bit would do, to make the cutouts quickly and accurately so that I could make as many as needed for a season of hunting, which for me here in southern Georgia is year round.
Some guys at work suggested that i patent the plans and templates and sell them on E-bay, but we will see if there is a big enough demand to go to all that trouble. Besides I am sure I might be infringing on someones design or idea. Right now I am happy to save a bundle on covers and replacement covers.
Mike