As a long-time beekeeper who has always hated working with WBC hives (like those in the OP), I must say I really like this!
The problem with making WBCs is mainly around the compound angles in the "lifts" - the external box layers - and that they're a multi-walled hive (the actual beehive was another set of boxes inside the exterior lifts).
As beehives, they are simply a complex & expensive menace, whereas as compost bins, the idea is great!
Just for reference, the WBC is named after the inventor, William Broughton Carr, who in 1890 developed the first really reusable beehive - before that, straw skeps were mainly used. WBCs were originally designed to be made out of old apple boxes and had an outer wall so that in the very harsh winters they had back then, you could pack straw between the inner and outer walls. They were also aimed at the then common Dark Northern European Bee - these were essentially wiped out in the early 1900s.
Since the disasters of the early 1900s, new strains of resistant bees were developed and these are much more fecund, so the colonies require larger boxes. Also, now our winters are milder and we have far simpler and more appropriate hives, the WBC is something of an anachronism.
Plans can be found at:
https://www.scottishbeekeepers.org.uk/images/education/techdatasheets/TDS number 7 wbc hive.pdf