Anyone know what ratio you should include rorarri, levees, accensi and cavalry to be "historic"? I read from Adrian Goldsworthy's book on Roman generals that the ratio of other troops in a pre-Marian legion was:
2 velites: 2 hastati: 2 principes: 1 triari

Should it be one levee for one hastati or just one for two? (Bearing in mind the different units sizes in EB). How common were rorarri? I read that they were phased out and looking at the stats, I can see why - they don't seem cost-effective, when you can get a much beefer hastati or principes to do the same job much better for roughly the same upkeep. Should I include them just to be authentic?

A current full stack for me would be:

4 levees
4 hastati
4 principes
2 triari
2 accensi
2 equites
1 general

But I suspect I am under-representing the heavy infantry (and rorari).

Also, anyone got any ideas about a plausible scale for RTW armies? How many legions did Rome have in the period? Is it best to think of half a stack as a legion? Or something else?