You're all close on the picture in post #33, by Redneck69:
On this particular smoke (Bacon), the top aluminum foil pan is there to catch anything that might drip on my AMNS, and it is there to hold the jug of Ice to keep the temp from running too high in this "almost" cold smoke.
The "Water Pan" is in there, because you are never supposed to operate an MES 30 or an MES 40 without the water pan in position.
The bottom--bottom foil pan is in there, instead of the regular bottom drip pan, because I didn't get around to putting the stock one back in, since I had to remove it to put my 6" X 6" AMNS under the bars & under the chip drawer.
Bear