Honestly, they look like a mix of Production Red or Sex-links. They don't look very EE at all. They are missing the leg color, some muffs and beards and just don't have any EE or Americauna coloring in their feathers. Where did you get these? Since they are in excess of 15 weeks, then you most...
I am sorry to hear your dilemma. We need ALOT of information in order to correctly answer your question as to why they are not laying. It may help if you let us know:
What breeds?
Coop size in relation to how many you have.
Free range or all cooped up?
Location, size and how high up are your...
My question is; Will homing chicks inside make them weaker to weather changes in the future and am I nuts for thinking that it is plausible to have them inside as they grow over the next few months?
Yes, in short, keeping a warming light on or keeping them inside will cause them not to gain...
My very first layer was a black sex link, sadly she disappeared a few weeks ago, and she started laying at 21 weeks. I have heard some start as soon as 18 weeks. She laid a nice medium brown egg and eventually they get to be large size and a nice brown.
I would say it takes them atleast close or after the 1 year mark, they are hens then, to lay consistently. You have a heritage breed and may see sooner results with your RIR's, especially if they are production reds. They will come into laying bigger eggs. Mine took about the 1 year mark to hit...
I never said barred rock definitively, it was a guess. Yes, it would be nice to see what experienced breeders would say. Ones which breed that breed! I do not!