3.5e Overhaul – Objective: Fixing ALL 3.5e's problems (P.E.A.C.H)

[nonsi]

So… I've noticed that there's nothing statistical listed for "Fractional BABs and Saves."

No need.
Full BAB = 1
Average BAB = 3/4
Poor BAB = 1/2.


Say you take 1 Mage level and 1 Monk level.
All you do is add 1/2 + 3/4 = 5/4 ---> 1 (rounding fractions down).

Nothing special there.
If you know where you were in the previous level, you know where you got to now.