Yes, like Red said, the 5 X 8 AMNPS was designed for that spot in the picture above. In fact, I had an MES 30 at the time Todd was designing it, and he called me & asked me to measure the space in mine. He wanted to make sure the AMNPS would fit there in all MES 30s. That's why it fits perfectly there, because of Todd's prior research and planning.
If I remember correctly, with the original AMNS, if you wanted to put it in the bottom, you had to remove the bottom drip pan, and put it under those support rods, because they were a full 6" wide.
If I ever have air flow trouble, I will try pulling the chip dumper out some, but I have found that if I get it lit properly, I don't have to mess with the Gen #1 MES 40 components.