Some comb, even old rough ugly comb is better than nothing, but if you have nothing it does not rule out catching a swarm. I try to alternate foundation less frames with starter strips and a couple pieces of old comb.
As far as I can tell the size of the box should be about the size of a ten frame deep.. I have caught them in smaller boxes and even a nuc size box. That was with the tiny commercial lure vials AND Lemongrass oil.. I am hoping the swarm commander ups the anti a bit.