I purchased some full extension Accuride slides and I’ve already installed one-half of each slide to four drawer boxes. The drawer spaces are 27 1/2″ wide and the slides are 1/2″ deep. So the space between them is 26 1/2″. Should I make my drawer boxes the same width as the space between the slides or should I make them 1/16″ or more less wide to avoid an overly tight fit? My boxes will be made of 1/2″ cabinet grade plywood so I can’t really shave the sides with a plane to perfect the fit. Is there a standard protocol for doing this? The directions that came with the slides are very poor.