Looking at the product, is it worth it for me to just order the extra pieces of the predator prevention from this company? Or would burying hardware cloth be just as good? Or is there something similar I can get somewhere else? I hate to give them any more business after how poorly the entire thing was handled but I also want to make sure my girls are safe and don't want to leave any openings.
Also, one of the 4' sides was originally going to be against the coop so it has a big hole where the chicken door would have been. We're using that piece as part of the run because my new coop is tall enough to not need it. What would you cover that opening with to make sure it's secure? Hardware cloth? Something stronger?
I would use the pieces you already have, but not worry about the small area that will be unprotected. If you do see efforts of animals trying to dig under, then treat remainder of perimeter. Not all predators succeed on first try digging under. Some will try and decide not worth the effort.
Your predator assortment is similar to what I have. We do have a few coyotes running around. There was a fox seen in the area. Naturally no shortage of raccoons.
I would not worry too much about the coyotes. They would prefer to jump/climb over top rather than dig under. I don't think they would want to get involved in digging, if there are possible other meals around. (squirrels, opossum, rabbits, rodents,and feral cats)
A fox, I would think would not likely focus on your coop/run, if there is other food available. (same as for coyote) People that do encounter fox problems, are usually individuals with larger flocks, and live where fox populations are high. Your chances of a fox encounter are not very high.
Raccoons,,,,, well yes, they like chicken,, just like most other living things including us humans. These urban raccoons are after getting into trash and eating leftover dinners, rather than trying to dig into a coop. They will try to get into coop area, if it is relatively easy. I don't thing digging is in their plans, except as last resort if no other food available. Yes, I know that raccoons have made their way into peoples' attics, and crawl spaces. Often times chewing thru plywood and such. It is in an effort to find winter housing for the season, as well as to raise family. A chicken coop, seeking a meal would not likely be an occurrence.
Opossum would be of little concern. Small ones that would get thru small opening, are not dangerous. Large ones that would get into a coop that would be accidentally left open for the night,, well that is somewhat different situation.
I have plenty opossum around my area, and never had a loss by them.
The panel with that opening you mention,, hardware cloth well secured is sufficiently strong enough. You can use a mess of zipties, or weave wire to connect HC to opening. As long as you can not push out with your hand, nether will another predator animal. They do not go to the extreme of knowing to chew thru plastic securing ties.
Now to the subject of free-ranging,,,
Everyone is in their own circumstances, and situations. The chickens do not need to be out most of the day, but be out in yard with you,,,, as your dogs are safely inside home. You can be enjoying some cool/cold Iced tea, and sitting enjoying the outdoors while watching your chickens. Is your yard secure enough to keep neighbors dogs out if you are in your yard??? I have friends that live in your direction. They are not allowed to build fences. I don't think they are allowed to have chickens ether.