The construction of the book case requires drilling a hole into the bottom board (slanted). After a few months, the book case has begun to lean because this “manually drilled” hole has dug into the wood and not provided a good support. I didn’t want to drill any holes in my wall to use the “J” parts from the instruction book and as a result, the book case leans. 

Overall, the design looks cool but it is not worth it to hold a lot of books or anything heavy.