sounds good. since you are willing to do the balancing i just decided to forward all related issues to you. and here's the first one:
the 'elder council' obsoletes too early at writing tech. i guess this was ment to prevent having the 'library' and the council build in same city. good intention, bad realization. better solution is to make the elder council upgrade to the library and let it expire later on at mathematics or some other post-writing tech.
the 'school of scribes' bonus is problematic. it gives +15% science. but when i look through the AIs cities i barely see a size larger than 2 - so i estimate that none of them would get even a single science bonus from a library right now. +3 or +4 science is much more adequate and would help fastening up research in the very early game stage (especially for AI) without being overpowered in later times (the +15% will result in more then 15 science in developed cities of industrial age!).
so my suggestion is:
School of Scribes: +3

, +1

with Alphabet, 25% faster production with Elder Council, replaces Elder Council
same problem with library. however due to realism one can consider an additional mild percent modifier for library:
Library: +5

, +5%

with Philosophy, 25% faster production with School of Scribes, replaces School of Scribes
i'll post more here when i progress in my snail game.
and make sure this changes make it into AND when they are tested and found to be adequate because they are balancing changes! i think you could spare Afforess quite some work if you start balancing the buildings for him.
EDIT: i mixed up library and school of scribes at one point. fixed that in my post.