Very recently I stumbled upon a forgotten vertical hive format (well, NOT forgotten in Poland and the surrounding areas in Germany, Ukraine, Belarus).
So, here is an intermediate vertical hive, not exactly as compact as Warre/Udav, but close to it.

The frame 300x260mm.
The cavity - same great square 300x300.
Fit my idea really well.
My frame will be 300x150 (the shortened Lang medium frame).

Here is an entire channel of a bee program ran on the multi-body Veliko-Pol'ski hives.
Now we are talking real business.
The channel is in Russian video, but those who see, will see that they need. Plenty of material just to observe.
This is the same guy who runs several no-maintenance log hives on his property - just for swarm generation.

https://www.youtube.com/channel/UCBo..._Ui6pihnZuszew