I intentionally don't put a full set of frames in.
I operate all mediums, but a medium nuc and a medium hive body arn't the best sizes that a swarm is looking for. I find I have better success with a deep nuc.
So, I put one drawn medium frame in there, and leave the rest empty. I've used foundationless frames for years, and when you put four or so next to each other, the bees don't always follow the guides. If I'm going to have to cut out the comb that they build, I'd rather cut it off the lid of the nuc than have to unravel the puzzle that is cris-crossed comb over four frames. Plus, only one frame makes the interior look bigger (at least, I guess).
A few drops of LGO near the entrance (inside, to soak into the wood) and a Swarm Lure from Russell's has gotten me the two swarms I have this year . . .