I'm getting ready to redo our kitchen and ordered the cabinet boxes pre-cut/drilled and will apply my own face frames. doors and drawers. The base boxes (except for the sink cabinet) come with a top. I am debating not using the top since I think it may make it more difficult to install the cabinets having to work inside them to screw them in place as opposed to being able to do it from the top. The boxes have a 1/4 inch back set in a groove 1/2 inch from the back edge and use a plywood spacer where they fasten to the wall. Do you see an advantage to using the cabinet box top on the base units. The top will be granite if that is important to know. Let me know what you think. Thanks.