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Where I live part of the year in LA we have them and we call them Cajun Microwaves. I have used them a few times, not hard to make, cook absolutely awesome. Search on instructables and youtube for videos on how to build.
I own a La Caja box and have used it many times it works great. I can cook a 40lb pig in about 3 1/2 hours. I also have a smoke daddy to plug into it and smoke it too.