That diamond shaped grill materail is called expanded steel I believe. I have an open pit outside in the back fourty too. You can pick it up at lowes, or home depot I believe. I dont know if they'll cut it for you or not. If not, try calling your local high school and see if they have a plasma cutter, or some other means of doing that for you. (My father in law cut mine) The hardest part is keeping it greased up so it wont rust. I treat it like I do my cast iron... bacon grease, get it hot, then put it in the garage out of the rain when I'm not using it. Its awesome for cooking salmon over alder outside!