Chuck, I guess it depends on how labor intensive you want the project to be. In its simplest form, you could remove the burner, go to dollar general and buy the deepest frying pan they have. Bore a hole in the side of the pan (to run your gas line through) and place your burner in the pan. Place the burner cover grate (the thing your chimney is sitting on in your photo) over the burner in the frying pan and you're set! $5, 15-20 minutes and you're in business.
At least a place to start..
Tim