So here's the cultural buildings changes I made if anyone wants to look at/use them.
Basically, I took the vanilla cultural buildings maintenance levels and multiplied them by 1.5, as that matches the maintenance increases in PB for everything but light infantry and knights. I then changed knights maintenance from 8 to 6 in defines.lua to bring them in line with the other maintenance levels, leaving light infantry at 1.
The troop types match PB, but adjusted numbers to meet the maintenance costs I laid out. Added bonuses to buildings that didn't have them (the bonuses are somewhat derived from vanilla, and then modified to be unique in cases where multiple cultures had the same troop type and bonus), and removed a few instances where cultural buildings were subtracting other troop types (I can appreciate the balance/army composition reasons for this, but it just didn't seem "fun").
End result is heavy infantry, pikemen, horse archers, and heavy cavalry cultural buildings having slightly lower numbers, while archers, light cavalry, and light infantry have slightly higher numbers when compared to PB. Lower or higher, the cultural levies are all bonused as well. The total levy (in maintenance cost) provided by the cultural buildings at max level is slightly lower than a max level barracks.
Don't forget to change knights maintenance from 8 to 6 in defines if you use it. It shouldn't really make a big difference, but it seemed neater this way.
Edit: To use them in PB, unzip the file and move it into mod\ProjectBalance\common\buildings. You may want to backup the PB cultural buildings file instead of overwriting it so you can go back to the original values.
