To hang heavy cabinet doors and conceal the hardware, use mortise European-style hinges. Use a 35-millimeter drill bit and set your drill press to a half-inch depth. Place the holes a quarter inch from the door's edge and when you set the depth, be careful not to drill through the door. Attach the hinge to the mortise. Then attach the door to the cabinet box. When the cabinets are installed, the hinges will be completely invisible.
For more on hardware, consider:
Style Your Kitchen with Cabinet Hardware
Hinge Styles: 10 Designs You Need to Know
Bit of Knowledge: Choosing the Right Drill Bit for the Job