I have a question regarding the 3-in-1 bar back. On page 14 where it talks about part # 7 needs to have a 1/2″ gap above the top set of supports to accommodate the thickness of the bottom cabinet top. In reference to part # 6 (middle shelf support), should that also have an 1/2″ gap at the top? I don’t see how part # 11 will sit and not touch the shelf supports on the middle support. Or should those be flush with the top? I hope I didn’t make this confusing.