I've got to include this someone. Pretty friggin epic, honestly.   Indeed. It's always been my thought that "darts" or "darters" meant javelins and javelinists/peltasts in these instances. I think the Kestros came a bit later, with the Macedonians, and would make for an interesting "special unit" for the Macedonians. 

I think these are better than the previous sets. Getting better and better.  May I suggest a custom tile decal for the Tachara? Like, a "Persian tile" motif. 

I made a preset functionality based on autociv's "bot" for ModernGUI

What about sea lions/walruses? 

Fascinating! Two slightly different approaches for a similar goal. The two of you should joint forces!