Looks good. I've been running 3-queen hives (one queen at the bottom, with two 5-frame nucs on top) using a very similar method for a few years now. As long as the queens are kept apart and each colony has it's own entrance in separate directions, things should be ok. With my set-up (only one brood box) I've found that swarming is more-or-less eliminated - presumably due to an increased level of Q pheromone ?From the bottom up, this is what I have: two deep boxes of brood, QE, one medium super, QE, one deep with 4 frames pulled from the deeps below (with the cell), empty comb and some with honey, and a couple of frames of foundation, and then inner cover (with opening) and outer cover. The new queen will emerge, and the two hives should, in theory, operate together.
I've never had a double queen hive before. Anything I should or should not do?
You might want to give some thought to how you will check for, and remove honey as it's capped - which is not something I have to worry about (I wish ...), and also how you will go about splitting the stack at some time in the future. With nucs, I just pull 'em off and set them on their own stands - your set-up may be slightly more involved. It'll certainly be heavier ...
Very best of luck.