A Scout need 150 man hours (total, not just personal) to complete an Eagle Scout project, which is one of the last steps to earning your Eagle Scout. It's a test of leadership. You can get materials donated, but most likely, to get those kind of hours just off of making signs, he'll be organizing scouts (who also need volunteer hours for various achievements) to make them themselves. I would almost expect wooden signs routered out, painted and sealed...probably with new, ground measured distances.
Big ups to all the Eagle Scouts playing DG. I wasn't even into discin at 18. I built playground equipment.