I am no expert but we have 3 hives of bees and we use the 10 frame Langstroth design. We use 2 deep boxes fro brood and mediums for honey supers.
We use purchased products. Your box looks well constructed but I wonder about the weight. Plywood is heavy and the bees will add 50-60 lbs of weight to one of those deep supers.
Don't forget that you will have to lift and move these supers periodically and they will be very heavy.
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