I don't think they are worth it. I've tried several configurations and the next one won't require moving supers to get to the brood chambers.
Make a three box long hive with the brood chambers on the ends two queen excluders to divide it into thirds and stack the supers up on the middle.
Put a 3/8" hole in each brood chamber to let the drones out. Put the entrance in the middle so both sides have to share the entrance to keep them mixed up. Put a top entrance on the supers to handle the traffic. It will be huges. Be sure to set it up as early as you can get the queens and bees so it can maximize before the main flow.
It will be much easier to run three regular hives and get the same amount of honey
But it's a fun experiment that I've done before.
Warning: that strong of a hive can be intimidating to work. There are a LOT of bees. And they are all on the same side.