You're talking about the little Brinkmann water pan from the cheapest ECB? I don't know if anyone has used that one with a WSM pan. I used the larger Brinkmann pan, and my WSM pan, to build the Piedmont pan mod. I don't see why you couldn't do the same with the smaller pan - as long as you maintain an air gap between the two pans (to insulate the top pan so that the grease dripping into it won't burn) it should work.