I don't have any experiance converting factions but i's imagine it involves editing pretty much all the files with any referance to the faction, if you really want to try it i'd reccomend making a copy of RTW just incase you really mess something up.
CarthageAnd beyond, green fields under a swift sunriseOh well, thats not so bad, is it?No, no it's not
Proud joint winner of the M2TWH Saladin award