Shorten the width of Ikea Billy?

I want to set up a Billy 80/202 plus extension in my living room. The wall niche for it is 3.16 meters long. Have you had any experience with shortening Billy as well as the extension in width? :rolleyes:

Not recommended, buy BENNO´s with it..

Not recommended, buy BENNO´s with it..

Thanks for the tip! :D I just have a little problem.....are there also shelf attachments for Benno? :confused:

:D hmm, no not yet.. but a second BENNO where you basically just saw away the "ground" would be an extension. ;)