While I'm not involved in this I can answer two historical questions.
1. The Camillian/Polybian Consular Army was 12.5% Cavaly, of which 1/4 were romani citizens and 1/4 extraordinarii, with the remaining 1/2 being Socii regulars. This is according to Polybias, the total Cavalry numbered 2,400, probably with 900 on each wing and 600 (extraordinarii) in reserve.
2. As far as the Roman "eras" go, there is evidence for cross-over with the immidiately previous era. Sulla used Velites in a reformed army when fighting Marius, for example. I would, however, say that Camillian units in a Marian army was historically absurd.
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