does anyone know how to create a different variant of an existing ship?
heres what im trying to do. im trying to create different variants of certain ships in fleetops that i can use alongside the existing models. for example an uprated sovie, or a sensor refit nebula.

im not trying to mod any textures or create a different model alltogether, basically the only thing i want different is the odf.
i've tried to simply copy the odfs, sods and simply rename them but this just causes the game to crash. and yes i have added them to the tecktrees and shipyards.
would appreciate any help

thnx
er....plz help