Even at 3:1 (What I budgeted for on our first run of 50, accounting for waste and what not) and processing at average 7 lbs it's about one 50 lb bag of feed to 3 birds. At $12 (average rate locally for standard starter and feed, we pay $2 more per bag for non-gmo ) its $4 per bird or so, not accounting for all the other expenses

Make sure you have a feeder that can accommodate all at once as they'll end up fighting over it of not. I also pour feed on the ground in several locations so they can all eat, though I have 42 currently.
I just processed the first of our meaties (we have raised layers for 1.5 yrs and have processed some of the roosters) at 7 weeks and I am very impressed. The largest of the flock is easily 8 lbs and I did one fryer size about 4 pounds since she had a busted leg and the meat development on her totally surpasses any heritage breed rooster by far.
Shelter wise they need something secure, that was the hardest part for me as I got behind but was going to build a new shelter for them with a large open run but I ended up fencing off half of one of our layer coops and gave them a run behind it. It wouldnt be nearly enough space for layers, as ours forage quite a bit (twice as many get half as much feed as the meaties) but it is perfect for them as they are very lazy except when eating. They wont need to roost so any shelter you build can have a low height if necessary.
I did this batch all on feed, as it is my first and somewhat large (to me) amount of chickens at one time so these didnt free range at all, which could significantly lower your feed bill, though I think it is reasonable already. I did feed a non gmo ration which we also give to our layers and it is comprised of whole grains and looks like you could add water and make a soup from it, vs the layer crumbles from
TSC or SS or whatever.