If you get some game-based highly predator aware chickens or mediterranian breeds that can reproduce often enough that roost in trees, they may work out better/cheaper than a totally enclosed coop. U_Stormcrow has a "landrace" he's working on in north florida - might check out how he's managing his chickens. There's a juggling act between predator aware, size, and # eggs laid, and ability to get nutrition from the land instead of commercial chicken feed.
https://www.backyardchickens.com/th...ctive-culling-project-very-long-term.1433421/
Basically, you have to hatch a lot and often, and/or have sufficient broody moms and have smart enough / agile enough chickens that the predators can't wipe them all out before they replace their numbers. You can train them to lay in certain places and show up for food. You may get less eggs and smaller eggs than production breeds, but if you have enough chickens, it makes up for this.
If you want a totally enclosed, predator secure coop, it's going to cost money for the initial outlay. If you plan to sell eggs, you'll also need a market. We have enough chickens for our family and to sell enough eggs to break even with feed costs, but the initial coop cost was about $1500-$2000. I ordered a 200 sq ft (10x20) greenhouse frame off of
Amazon and covered it in hardware cloth, with a 3 ft apron. Tarp over the top, no actual coop since I don't get snow here, and it holds ~13 chickens at ~15 sq ft per chicken. I put egg stamps on my eggs to make them "boutique" and sell to folks who I know that live near me. If it required more effort/traveling/advertising, it would be hard to make the money back.
You may need to use chain link fencing/dog kennel panels covered with hardware cloth if you're concerned about dogs. You can put kennel panels over the top, or top rail with T-brackets, but again, it will be pricey. And if you have snow, you'll need to be sure to slant and support your roof.
There is an Article or Thread on this site where someone converted a camper like that into a coop, and then they had a run outside the camper using electric poultry netting (Premier one electric netting). It does work, but she had some rodent/snake infestation issues in the camper so sealing up all entrances/exits was key.