Yes! I'm always that person looking for cheap/DIY/recycled fix to any project. Pallets are free, so why not use em, right? And I'm mainly just having to build a roof and door, gonna use the preexisting fence in the area as the walls.
I've never bought any premade coops, but the ones I've seen kinda suck. Mainly way too small and over priced. Honestly if you need something smaller scale, you probably do good to build it yourself or find a handy neighbor, friend, family member you could pay some money to to set one up for you.
Tin isn't so much a problem if youre using it as a roof, so long as it's well ventilated. It makes a great shade for my run. If it's used as a roof of a coop you could also have shade over it (tree, shade fabric) and/or paint it a color that reflects heat well.
I also have to fight with predators (Feral cats and loose dogs) You mainly need to make sure you have a strong frame for your run and find some good wire or mesh to put on it.
The sunny day remains!! Now if only I can get home to work on the build

Of course the first really nice day has me without a vehicle and places to go. Lol