Find an old pick up wheel (I got mine on Free-Cycle), Pick up a package of Ikea Capita legs- the 8" legs would have been better ( I had the 6" legs sitting around). Then take the leg mounts and put them on the deep side of the truck wheel, screw the legs through the other side, pick up agrill top (mine is for a weber grill- 18") or take one off an old bbq, Use some hardware cloth (fencing) Inside the deep end for an ash catcher. And you are done! Happy BBQ'ing!
Note: You might want to add some small C-Clamps to keep the grill centered orwhat I did is put some nuts and bolts through the top of the grill to act as a stopper!