Chickens & bantams together?

I have both large fowl and bantam together, the bantams are just the bottom of the pecking order.  They don't tend to want to sleep with the big girls in the coop though.  Some sleep in the rafters of the walk in run, some sleep on a small table despite having an empty classic eglu they could use!   

You can have bantams laying at 16 weeks which I have had this year, but my last years hatch missed laying before winter so they were nearly a year old when they started.  You can keep your young birds on growers until they start to lay so you should be alright with that plan.  They will need layers as soon as they start to lay though.

That's good to hear, thank you!