OK, here's a list of the modifications, Allen.
1) The APCs have missile launchers attached to their turrets, made out of plastic tubing.
2) The mortar carriers have mortar tubes made out of paperclip bits drilled into them and, in the case, of the Light Attack Company's carrier, plastic card hatches.
3) The support mechas have missile launchers assembled out of plastic tubing.
4) The titans originally had a tiny little weapon that looked like a hand-drill. I greatly extended its barrel with plastic tubing.
5) Both the small hover recon GEV in front of the headquarters and the large drone with the power armor are completely home-made. The GEV was built up out of plasticard and the drone began life as a small round map stick-pin. It was made more drone-like by gluing assorted pīlastic greeblies to it.
6) Oh, and the drone swarms are simply the ends of paintbrush handles with pits drilled into them and beads dropped into the pits and painted.