From the album: Modding School Homework
The beehives are a vanilla mesh, but my own custom object definition in the CK to allow custom container contents.
IRL, beehives would be a good deal smaller, especially smaller entrances. Holes that big would mean two things: (1) your bees would be making honey to feed mice, skunks, and other small mammals, and (2) because of frequent raids by animals, the bees would be cranky as all-get-out and the poor beekeeper would be stung a lot!
I know this because....yes, you guessed it.
If I were going to release this mod, I'd either shrink the beehives to about 50% or 60% size, or I'd use my custom skep meshes that I made in Blender. For an exercise, I stayed with what Bethesda thinks a beehive looks like.