Looking online, I can't really tell. If anyone has a Jumbo Joe and wouldn't mind taking a measurement of the inside diameter of the bowl, as well as the inside diameter of the lip of the lid, I think I might be able to find the proper pot. I'm thinking even if the pot is $100, I'd still be way ahead of the price on the 18.5 WSM, and would have direct grilling capabilities. With the warmer weather I'm seriously jonesing to do some smoking, and if I can do a mini (Midi?) based on the Jumbo Joe I think it would be pretty nice to have the extra space. Had thought of the body extension for the 18.5, but I don't think it's an exact fit for the Jumbo.