The pics below speak for themselves. Started with a 4" diameter aluminum dryer coupling and cut out the riveted strip with tin snips and over lapped the coupling to reduce to the opening of the Mes chip loader hole for a custom fit. Secured with two screws. Traced the tapered end of the coupling to the top rear of the mailbox and punched a hole in the center and cut out hole with tin snips. Everything fits tightly together. One hour max to fabricate and well under $20. With jack $35 (but I already had it.) I may make a permanent stand. The jack can be positioned anywhere out of the way. I mocked everything up indoors on my spare Mes.
The mailbox came with four holes and a slit in the bottom rear half and four on the front half. Before cutting three holes in the front door in an equilateral triangle I'll put business card magnets over the rear bottom holes and slit and keep open the front bottom four to see how it breathes since there's less volume for drafting outside the MES than with the snorkel aluminum flex tubing. I'll put the AMNPS in the middle of the mailbox right behind the front four bottom holes.
Time to test the ventilation with a full AMNPS on a store bought flat corned beef for pastrami. It's a bit nippily out so I may have to wait.