Another problem I see with the tarp over the cattle panels on the roof is that it will take a raccoon about 2 seconds to climb up the side of that structure, tear the tarp and climb through those holes in the cattle panel. I use them in my garden for the cucumbers and pole beans and the holes in them are plenty big enough for raccoons to get through and I'll bet you've got a lot of them where you live.
By the way I think your skills in woodworking are just fine plus you're learning a lot too!
By the way I think your skills in woodworking are just fine plus you're learning a lot too!