First of all, ingenious idea and implementation! This is the kind of stuff that should be integrated with vanilla imho.
So I noticed that the description of the buildings about connecting more than one building of the same type to the growth vat will have no effect, doesn't match the corresponding infocards. For the Neurosimulator it actually says : max connected by building : 8 and for the other two, 999. So i took a look at the xml and sure enough, it specifies as such under maxSimultaneous. Not sure why wasn't mentioned by anyone else, if it's intentional or what not. Just wanted to report it.
Second point is that children under the same circumstances receive differents growth points, and for the life of me I can't figure out why. I guessed it was the Growth Vat Accelerator by Kathanon as it speeds up the growth process but as i mentioned, same conditions lead to different outcomes.
Hope this helps in some way, and thanks for the contribution to the community! Peace