John,
The assembly of the PC-21 is pretty straightforward. If you would refer to post#75 in this thread, Kirk provided pictures of his cockpit canopy assembly and also a picture showing the flap/hinge assembly. The only thing I can add is to suggest that you plan to install your equipment (batteries, valves, pump, ecu, etc.) In front of the main fuel tank. This will reduce the amount of weight needed to balance your model.