Military colony is a very hellenistic thing but it would be possible to have a similar building with different name.
Maybe do like my above suggestion for Suebians, and have great hall UB where they can choose some regional mercs (Saxons, Franks, Vandals, Steppe raiders, romanized foederati etc.) perhaps train heros as well.
One thing to settle is how the Ostrogoth/Visigoth divide is implemented (At the start like Hyrule Conquest ? two different techs for reaching the next phase ?).
Looks great, the shingle roof on the old version was a bit vikingish and not very fitting for Suebians.