Not sure if this has been done before, but I was inspired by the bigger better basket mod and I saw a photo of how a pizza cue set up clearly had the charcoal shaped in a "C" shape. Prior to this mod I would do what everyone else would do. Use a couple charcoal baskets in a partial "C" shape and bank the coals against the bowl. It works, but it generally it would still require coals right against the bowl. So I had some extra charcoal baskets laying around and decided to try something different.
First things first I used some pliers to disassemble 3 charcoal baskets. I took two of the outside pieces of the baskets and using the existing holes I took some old screw/nut hardware and fastened them together. Using two inside/bottom pieces I test fitted them inside the bowl with the charcoal grate. I used a sharpie to mark how wide I wanted the basket to be and then set a 3rd inside/bottom piece inside the big basket to figure out the placement. I then marked where I wanted to drill my holes to attach two more screws/nuts. I used a nail to punch a hole in the metal and then a step down drill bit to widen the holes out. I test fitted the 3rd inside/bottom piece in the big basket again to mark two holes where the existing holes already were in the big basket. After all my holes were drilled, I reassembled the 3rd basket in its original form, placed it in the big basket, and it attached it all together with hardware. Did a little metal shaping by hand in the grill and it was done.
I think it should work pretty well. At its narrowest point there is approximately a 3" gap at the ends of the "C" channel and towards the middle there is probably a 6" gap. Probably the best part of the basket is that it should keep a majority of the coals from being directly against the bowl of the grill. I plan on giving it a test run this weekend!
Let me know if anyone has questions!