I've been using this method (from Alton Brown's show) for a while though I find myself preferring using my BGE these days. I even "age" my steaks for three days in my fridge similar Alton Brown's suggestion. I have a Weber Charcoal Chimney Starter and it is barely big enough for a typical porterhouse. I use my fireplace gloves to help coax the steak to fit if needed. I've made a lot of steaks this way and the only issue I've had was once not adding enough lump charcoal. This is a great way to make a single steak.
Thanks. It's a fun way to make a single steak. If u have a charcoal basket from your smoker, u could prob use that over your steaks to make more than 1 or 2 at a time!