IF you are completely static - just do 20-frame rigs; even 24-25 frames.
IF mobility is a non-issue - go big and don't worry; the size is an advantage in any other way (but mobility).
Provision a way to be able to run two independent colonies in the same hive then - two entrances and a bee-proof division board.
If space was available to me - I'd do a bunch of 24-frame rigs with the lids swinging up and call it a day.
These are so easy to work in most any function, you'd never want anything else.
This is really a great design for a busy homesteader where you have little time for the bees - these hives are pretty much autonomous.
I just do my ventilation the same way Leo does. It works.
Sandwich of XPS between exterior-grade and interior-grade plywood should be good (I have one hive like this but stupidly used an interior-grade plywood outside - avoid this stupidity - even paint did not help).
The PVC-lined entrances is a good idea; I am considering this in future too (e.g. to protect the insulation from the bees).
Just now occurred to me - I used a metal mesh to the same effect (wish the PVC occurred to me - I'd use that).
All my entrances are - 1/2 inch round holes (I just have several of them).
FYI - don't exposed any foam to be bees (protect/cover it somehow) - they will almost certainly chew on it (I have issues of this kind).
Burlap they also chew on, but to a lesser degree; I read they don't really like the chemistry of the foam and are trying to get rid of it.