Thank you, Bear for the reply!
I have a MES 30 and don't have the surface area that a 40 does. I've been a little concerned about heat flow (with an 800w element)) as well as smoke flow using a large catch pan. On this cook, I cut the pan down and used a wire rack somewhat similar to your suggestion. I'll be interested in how much drippings I get in both the catch pan and the bottom tray. If very little, I may go with just catching the drippings in the bottom pan and "drawer". I was just interested in your arrangement when I saw it as I hadn't considered a catch pan sitting on the very bottom.
Again, THANKS!
Backpacker
I forget how big the MES 30 racks are, but as long as you have an inch on all sides or about 2" on two sides your air flow shouldn't be a problem. I believe a 9" X 11" pan would be OK on a rack or two.
Bear