Finish shape your design from a single piece of wood or from sticks. Dip in a copper solution. Drill a single shaft into the heart of the board. Introduce termites. Plug the opening to the shaft. Let nature take it's course. The copper is toxic to the termites, so as the approach the surface they will die. Lot's of kinks to work out, but it is a start.
Happy New Year, Ya'll !!!