Excellent stuff. A few little nitpicks - your numbers of crew (sailors and marines) are on the high side. Any additional people not actually required for powering or steering a polyreme are endangering the vessel. The standard marine complement for a trieres/trireme was 14 marines (12 heavy infantry and two archers). They’d then throw themselves around as outboard steerage when necessary. Standard sailor complement was 10. The Romans did like to overload their ships with marines, but that was because they were poor sailors and usually operating close to land. If you were travelling any distance, those numbers would risk the ship if a storm blew up.
A bireme refers more to the oar arrangement than its size; you could get a ship with a similar number of rowers to a trireme that is a bireme (indeed it’s likely a lot of the larger polyremes used a bireme arrangement). I reckoned the “small galley” in the book was equivalent to a pentekonter or hemiolia. I then slotted in a “medium galley” representing a trihemiolia (again not necessarily accurate, it could also refer to a trireme that could lower its sails without taking their masts apart) with 120 rowers.
How will you measure oarsman quality (ie training/experience), condition (fatigue and food) and morale? Raw conscripts is fine for slaves chained to their benches or green crews, but what about professional oarsmen? Or well-trained citizen oarsmen like Athens could draw upon?
If you’ve distinguished Light Hulls, they should be undecked (since that aids in lightening). Which means you can target the rowers, since there’s just boards for moving about up top, rather than a complete coverage. It does mean better ventilation for the rowers, since they’re not enclosed in a small space.
A trireme was probably faster under oar than a quinquireme, something about the power:weight ratio. A quadrireme was also reckoned slightly faster, but nowhere near as durable in a fight. The heavier polyremes (sixes, sevens, etc) should probably be slower; there’s a number of good reasons the five remained the mainstay of any serious navy.
Lastly, I see ramming, but not oar-shearing as an attack. Skilled navies like the Rhodians preferred to attack the oars rather than risk getting stuck in another vessel and being boarded.