Carl, For the joinery, I used all sorts! The sub faces are joined by a 1/4" box joint to form the 90 degree angle. I attached the sub-front to the sides initially with glue and some brad nails, nailed from the front as to be hidden by the finish face. After the glue had set, I glued in some triangular blocks in the inside corners to reinforce the joint, then drilled and inserted two dowel pins horizontally through the sides/blocks/sub faces to lock the whole thing together.
The finish face pieces are just a but joint with a couple biscuits. I drilled the screw holes through the above mentioned triangular blocks to attach the finish face to the sub face.
Does that make sense?
I figured this would make a stronger joint than the ones I had examined at Lowes, which were just entirely face nailed together. They looked really sloppy I thought.