Thanks, all. Right now they're a week old. I'm just keeping food in there all the time and letting them eat as they'd like. I'd like to move them into a chicken tractor as soon as I feel they no longer need the heat plate. My concern is that it's really hot, even here in NH, during the day.
I may go to the 12 on 12 off feeding schedule, but putting them to bed on an empty stomach seems unnatural for chickens.
My plan WAS to make an 8 x 10 tractor and cover the last 4' top and sides and move it every day or so. I have 25 birds. If they do well in the tractor and get crowded, I may let them pasture. I really don't know. I've only raised layers.
I guess I just have reservations about restricting their feed. Everyone has different advice.
I dislike having meaties in July because of the heat myself, but I just processed some for other folks that were fine if not uncomfortable. With yours a week old, they won't be too heavy before it starts cooling down in late August. You'll be fine to put them in a tractor at week 3 or so. 8x10 is plenty of space for 25, just move it to fresh pasture daily to avoid a giant turd pile.
The only way to keep CCX healthy is to restrict feed, fermented or not, they'll eat themselves into broken legs and shutdown organs otherwise. I like having them sleep with a full crop, so feed in the afternoon... which forces them to forage in the morning within their tractor.