Yes it is. It has 6 or 8 long screws securing it to the framing of the shed
Discussion
Bold build. Cantilever stuff is hard to get right. It’ll come in useful here for raking out rabbit poop. I presume that’s why you went with this build.
You’re exactly right. I have a few years experience in construction/ custom cabinet making and we did quite a bit of cantilevered projects.