Modding SW3?

[Kothyxaan]

ive tried changing the rocket slots on the Hrimturs to small guns and to big guns but neither work,
i edited the Hrimturs in the carcass.xml in /data/game folder and the Hrimturs in the /texture/interface/slots/carcass
i tried changing one of the rocket slots to a big gun then a small gun, neither works
when the ship is bought the appropriate slots are there but they dont wont accept guns

any apologies if this question has been asked before