I would like to reiterate what everyone is saying. CXs are specifically bred for meat. They are very frail health-wise because they are meant to grow as rapidly as possible with no regard for health or longevity. They grow like weeds, but their internal organs are frequently mush, especially their hearts. They have no tolerance for stress, as a result. These birds are going to break your heart if you get attached to them. They are not built for the long haul. You may be able to keep them alive for a couple years with careful dietary and temperature management, but it will be a lot of work on your part, and even with that extra work they simply may succumb to their bad engineering. They will also destroy the lone female if kept with her once puberty hits. 5:1 ratio is not going to work. You should also consider what 5 roosters are going to sound like in a few months...LOUD.
I would highly recommend selling these birds and getting a nice flock of layers. These should sell easily because there is always a demand for meaties. Sorry to be so negative about this, but I raise a couple batches of meaties each year and I have first hand experience in dealing with them. I have seen the shape they are in by processing time, which is only 9 weeks old. I am always shocked when people can keep them alive for a year or two past that, but usually no longer than that because of their health issues.
Good luck.