I almost never get my chicken broth to set up and gel. I used to worry about it, but don't anymore. I read somewhere that something like cooking time and temperatures can make the collagen just not gelatinous, and it's still okay. *shrug* I always use feet.
I typically will bag 5 backs and necks together for the freezer when I'm doing a batch of birds. I also bag up wing tips and other little sundry bits if I buy a pack of wings to make buffalo wings for Mom. My freezer is just lots of little vacuum sealed bags of chicken parts, I swear
I usually just buy a pack of feet. This last time, with the Cornish X broilers, I did save the feet and tried to blanch and peel them and that skin would NOT come off no matter what I did. I dunno what the problem was, but I was tired and irritated and chucked them. It seems like it peels off of older birds' feet much better. They're cheap at the store anyway, and already peeled.
I'm a little more old school with the broth, as I actually boil the parts first to flush the scum out. So I'll get the big stock pot out, throw the backs and such in, cover with water, and bring to a rolling boil. Once it's there, I dump it out in the sink, rinse the parts off, and THEN they go either in the pressure pot or the big electric roaster. The roaster will hold 8 backs, but 7 would be a better fit. Then I add my carrot/celery/onion, a couple bay leaves, a small handful of peppercorns (I got the tricolor on sale, I don't know if it makes much of a difference lol) and generally that's all. If I happen to have some other fresh green herbs around that are on their way out, they can go in too. Cover with water, set on low, and off she goes. I'll usually let it go at least a full day, if not two or three. Basically whenever I feel like dealing with it, I do.
I'm wanting to can it rather than freeze it next time. Wondering if not de-fatting it before canning would be any sort of problem or not. I assume since it's meat-based it needs to be pressure-canned rather than water bath?