My guess is your market might be commercial pallets.
Hobby beekeepers want a traditional wood hive, and some go to ridiculous lengths to make them jewel boxes.
The 4 and 6 way pallet hives can definitely be optimized. Box to box connections are weak, box to base are funky W-clips or hive staples, and stacks are independent of each other. Forklifting pallets over rough terrain has resulted in shifting and falling stacks.
A fixed pallet floor piece with molded sockets for connections might be useful. Pallets frequently rot/break and a plastic design for this element might be a selling point. Having all 4 bottoms as a single molding seems like it may work to stabilize the stacks above. Individual boxes will likely want to be maintained for ease in resorting dinks, etc. but quick release side to side connections binding the stacks as a unit might prove invaluable.
I think a single overall top cover might work-- all hives are typically maintained in double deep formation or are supered simultaneously. A single cover would stabilize the underlying stacks. Transport stacks pallets 2 or 3 high, and the stacks would be easier to strap with single top covers. Insulation, ventilation and lifespan of a plastic top-cover might be advantageous.
I'm not sure how uncovering 4 (6) hives at a time might cause problems -- would be easy to implement in plywood, and you don't see this, so weight or disturbance might be an issue.
So my advice, is don't try and capture the hobby market, but try and create a niche for weather resistant and easily forklifted commercial hives.