Re: Moisture Board versus Quilt Block?
Vent the interior by a small bottom entrance opening and a top entrance.
Install extra insulation on top so interior top is not the coldest part of the hive. Any moisture condensation will occur on cold surfaces first.
Personally, I use a feed rim with a 3/4 round entrance/vent hole, an inner cover with notch up, a quilt box above inner cover, and a telescopic hive with 2 1/2 Styrofoam permanently installed. Inner cover will catch any drips that might occur from quilt box( I have never seen evidence of this). The notch up vents the cavity between top side of inner cover and underside of quilt box.
Quilt boxes work best with side holes in quilt box and/or venting of area above shavings. Moisture works it way through shavings in quilt box and exits hive. I have never used a quilt box with a bee cozy but would suspect you may get some moisture trapped in the quilt box and get some molding happening.
Zone 3b. If you always do what you always did, you'll always get what you always got!