Hi Shorty...your well...er...short now. You have changed your person at the side.
Have you heard the jokes about how many does it take to change a light bulb? Thats what im thinking with your 120 construction workers.
Have em cutting trees before the trees die out naturally.
Have em sawing wood for faster lumber production.
Have em farming/exportingmining anything but dont have that many construction tents. They cannot all get around a building to build it at the same time...they would spend ages walking to a site only to find others finish it before they got there.
But it must look cool
120 worker converging on a site trying to build something. Perhaps you could hire some out to Privateer next time he plans to build an Airport (he took 29 years!)