I wish I knew how to make armors...
Pull a Plato and put an extra shape heeds model and use his script.
Seriously, just use the bloko minifig reference to make your armor the right size, use the armor script (heed said anyone could use it) and put your .dts model name in place of the body armor name, and change image names and such to avoid confliction with heeds armor. I could help you with any other armor problems if you want.
Edit: I'm not sure if a mountPoint is nessicary, as long as you center your model.
