If you get hardware cloth, get the 1/4 inch size. I wouldn't trust that a raccoon couldn't reach through a 1 inch square.
And, yes, attaching a tarp to the inside would be harder. I haven't done that myself, and was trying to brainstorm possible solutions. If I were to try it, I would try essentially sewing it down. Making small holes that I would poke wire through and than linking the tarp to the structure that way. All and all, 1/4 inch HW cloth would be a better solution. It's basically the gold standard when it comes to predator proofing chicken coops.
And, yes, attaching a tarp to the inside would be harder. I haven't done that myself, and was trying to brainstorm possible solutions. If I were to try it, I would try essentially sewing it down. Making small holes that I would poke wire through and than linking the tarp to the structure that way. All and all, 1/4 inch HW cloth would be a better solution. It's basically the gold standard when it comes to predator proofing chicken coops.