Here's 2 pictures of others set ups, I like the 1st one instead of a heating pad. You could use red bulbs and metal screen. The screen I used was fiberglass.
In the 2nd picture they used the top drawers for the males and unsexed babies and the 3rd drawer for breeding and bottom drawer for supplies. Not sure how you'd heat it all to 90 degrees though. I guess maybe you'd only need to heat the breeding drawer that high with a heating pad. I like this one, too.
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I like your box setup better than these, I think I would have hissers in the same tank I had them in before, it was a 30 gal aquarium with a screen lid the Dubia I would set up like your tub, I was looking at heat pads and all of them have a 2 hour auto shut off, How would you get around that?
How will your fiberglass screen hold up to a light being set on top?
Why not use a gardener's mat - the kind they use under trays to start seedlings.