The company I work for manufactures cabinetry and other furniture, mainly in MFC, Melamine Faced MDF and laminated MDF.
I could help you out with designs if you like but really the best idea is to sketch up what you want first by looking at;
1. Where the cabinets will fit
2. What you want to keep in the cabinets (will drawers work or will you need large spaces)
3. Working heights (will you be standing up next to the cabinets say in a kitchen or will you be seated like a desk)
4. Materials (this is best based on what you know you have available and can work with)
Melamine coated boards are easy to work and finish but sealing the edges is a problem since not many people have access to edgebanding machines (and painting or lacquering cut edges never looks good)
Depending on what you plan to make MDF is probably easier to work than ply since its lack of grain structure means you can drill it chop it hack it and cut it without fear of it splitting.
you will also need to look into hinges, drawer boxes and runners, shelf fixings and handles when you design.
Any questions I will try to answer them for you.