Firstly, the product is great. The cushions feel a bit flimsy and could use a touch of glue to properly nail down, but aside from that the only other problem is actually building it.
Advice from someone who just built it:
1: it’s a two or 3 person job. DO NOT attempt to build this by yourself.
2: once it’s built, get 2 people to hold it against the wall and mark the drill holes.
3: drill the holes, then get the bolts that are for anchoring to the walls. Tighten them finger tight and then hammer into the wall. Drill the bolts shut, anchoring them in. Then undo the bolt and the nut at the back should be firmly in place ready for mounting. Again - this is NOT a single person job.
4: once your anchors are in, there’s no getting them out, so if you need spares, I recommend the large nylon hammer fixings. We used 2 on here, as you don’t get spare bolts for the case where you F up.
The cats love it - so it’s all wins here.