That depends on how much cleaning you wanna do. It makes me uncomfortable to have them penned though I realize they may prefer the pen to freezer camp.
I have kept Silkies in rabbit cages when needed. And I built a few open bottom pens that were 18x36 LW and 18 inches tall. They worked well...
Oh ya, it would be hell frozen over before I could add boys together that age without a blood bath...
I keep lot's of rooster together and swap them into the ladies as you hope to do... but ALL identifiable cockerels go into the stag coop as soon as they are noticeable and/or weaned from mum or...