I have made a few and the recipients really appreciate them. Like ckcowl said, use 1/2 inch seams and press them open. I put a pocket block on each corner so that the user could put in a rock to anchor the quilt to the ground if necessary. Some people use the side seams in the blocks--which will allow you to get a 10-12 inch block (cut open along the inseam and lay flat. you should be able to get 2 large blocks per leg that way. Some do not like them especially if the quilt is made to lie on instead of under. I backed one of mine with heavy well shrunk flannel and just used a crosshatch quilting. No batting. Another one, I backed with cammo fabric and ended up tying that one instead of quilting in. Also as ckcowl said, use a denim needle and heavy thread and be ready for tired hands. It really is a feeling of accomplishment tho.