Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
This tutorial shows how add a collision. The collision is a special mesh where the enemy proyectiles will impact and it must covert the hardpoints because if not it will not be destroyed.
The collision needs a special shader named meshcollision and it needs be indicated on the alo export options.