>I'm hoping some of you can help clarify my thinking about modifying 8 or 10 frame medium boxes to use as nucs.
First keep in mind that an eight frame medium is exactly the same volume as a five frame deep nuc box. So if you're trying to get the equivalent of a five frame deep nuc box, you already have that.
>The goal is to keep all woodenware the same so I can handle it alone, and repurpose as needed. If I understand the purpose of a nuc is to confine the bees to raise a queen or provide a newly mated queen with a minimal "court" and give a new colony some brood to kickstart a hive then that is the basis for the idea. Take a standard medium but use only 3-5 frames in the middle, on the sides use solid frames to reduce the space. Once the original frames are fully drawn, remove the solid wood frames and replace with open frames to expand the area.
The only problem with dividing is getting a bee proof seal. This requires either a groove in the box for the divider to fit in or a really good seal (usually from hardware cloth) around the divider. If you use 1/4" Luan you can get three two frame nucs or two four frame nucs from one eight frame medium. The other issue is the bees spilling over from one side to the other. I use canvas inner covers for this, but you could also make this out of 1/4" luan or out of old political signs.