Quote Originally Posted by nomadewolf View Post
UPDATE:
Can now build Gallic Buildings, train Gallic units, units look good on battle map.
But the cards still all look like peasants...
Did you miss this step below? You need to do it for every unit which was not originally recruitable by the faction you are re-using:

Now we copy the unit card and unit information card for the general's bodyguard unit. Go to Data\packs\DATA\UI\UNIT_INFO\GREEK_CITIES. Copy the file GREEK_GENERALS_GUARD_CAVALRY_EARLY_INFO.TGA and paste it into the new folder Data\UI\UNIT_INFO\ROMANS_BRUTII. Now got to Data\packs\DATA\UI\UNITS\GREEK_CITIES, copy #GREEK_GENERALS_GUARD_CAVALRY_EARLY.TGA, and paste it into Data\UI\UNITS\ROMANS_BRUTII.

This is in the section "Make Greek Units Recruitable by the Syracusans", and of course you'll need to substitute the proper unit and faction names.