I just built a 5 frame nuc for mediums. I figure if they can fill five large frames up, then they should be in a full size hive and I like the idea of going to all mediums too. The med. nuc is nice and light. I could carry it full of bees and honey very easily. I put a screen bottom in and cut a hole near the top on one side. All I have to do is put a cork in to stop it up!! I have nothing to put in the nuc, but everyone says to keep one handy, so there it is!! I used beesource, but really just did it my own way.