Lastly, we have tops. Most cabinets include a top of some sort. In various cases, the top is simply to enclose the compartments inside the cabinet and serves no other purpose.

You can measure and layout on paper the design of your kitchen using the existing kitchen as a example of how things are constructed then break it down into a parts list forgetting any doors, drawers, or hardware for the time being. Just concentrate on the shell.

When you have your parts list ready you can buy the materials and hire a cabinet shop to cut and mill the parts for the boxes and what your left with is assembling the boxes. This is not uncommon practice in cabinetry now days as more cabinet manufactures are farming out there work so they can produce more. The cabinet shop will package the order for each box making it easier to identify the cabinet and understand the assembly.