It seems the file still contained the "no_custom" attributes for several units. Removing these should make all units available in custom battles.
"Non i titoli illustrano gli uomini, ma gli uomini i titoli." - Niccolo Machiavelli, Discorsi
"Du musst die Sterne und den Mond enthaupten, und am besten auch den Zar. Die Gestirne werden sich behaupten, aber wahrscheinlich nicht der Zar." - Einstürzende Neubauten, Weil, Weil, Weil
On an eternal crusade for reason, logics, catholicism and chocolate. Mostly chocolate, though.