I'm still new to all of this but my thought or concern could be a wasp problem with so many entrances to defend.
Good - somebody's catching on ... that's why they are of small diameter! With both wasps and robbing in mind.
Most of my full-sized hives have 4x 22mm circular hole entrances, although for much of the year they run with just 2 open. All nucs have 2x 22mm dia holes. If you 'run the numbers' (pi-r-squared) to get the entrance area, you'll find that 14x 11mm holes have a very similar area to 4x 22mm.
More importantly, I think, are observations made of 'traffic movement' through my standard 22mm dia holes. Usually 2 bees either enter or exit or pass each other through such holes - that's 8 bee-movements at any one time, through 4 holes. Very occasionally - as when a flow is on - 3 bees may cross paths through one hole.
So - 8 bee-movements, occasionally 12. With 11mm holes, there can only be one bee-movement at any one time (so they're easily defended), and with the number of holes provided, that's a possible 14 bee-movements - more than with my standard 4x 22mm dia holes.
Now, needless to say, none of this is anywhere near definite, or accurate, it's just the sort of thinking that went into deciding how many holes to provide and how large they should be.
FWIW, I started by considering a single vertical slot entance, cut from top to bottom - but that isn't very practical. Why a continuous slot ? - because that removes any 'step-choice'. But I'm hoping that a large number of holes will approximate to such a slot.
Why not simply one entrance at the top, and another at the bottom ? - because that might influence an 'either/or' exclusive-logic choice. In practice there may be a tendency to select towards the bottom, or the top, or even towards the middle - or - there may be no selection at all. I'm actually rather hoping that there will be no selection made, and that the bees will adjust their comb construction accordingly.
But - they will do what they will do. And, if anything of significance should occur, then a more comprehensive experiment could be conducted next year, employing far more boxes.

LJ