I don't know of any, imo your best bet is to simply take a look at an already existing modular civ and do the same thing.
Basically there is next to no difference between the modular and a non-modular civ. The main difference is that rather than adding your definition to CIV4CivilizationInfos.xml, you create a new file just for your civ (e.g. <MyCiv>_Byzantium_CIV4CivilizationInfos.xml). The same is true for all other files which go with the civ (e.g. units, buildings, leaderheads). You do one file per civ / buidling / leader.