A good technique or method that some of us use here is to use on custom cabinets is a blind dovetail joint to connect the edges and corners.  How a cabinet maker would accomplish this is they can effortlessly go through every object of wood-grain on the intersection where they meet and take a portable ban saw and make a narrow incision going outward on the inverted side of the custom cabinets. The cabinet maker does this all the way down the female side of the wood. Then on the male side of the custom cabinets he is going to want to make a shape that is compatible with the inverted piece of plywood. This allows it to work as a levy to anchor it together to give the custom cabinets amazing strength. The cabinet maker repeats the exercise through-out the board just like he did on the inverted side of the cabinet.