I sent my order into Ponoko. Their P1 size (roughly 7" x 7") couldn't fit a full cabinet, so I had to use their P2 size (roughly 15" x 15"). The P2 size can fit three comfortably, with probably too much room to spare (wasted material, I guess). I started thinking of different configurations the panels could take on to form different cabinet types.
I was thinking of putting together notches to make putting it together easier, but then decided it would lock me into one configuration. Doing it this way would allow freedom of choice, albeit also increase the room for error.
I should be getting this in in about 2 weeks. Will have to post photos of the cabinets then!