The problem here seems to be the fitting of a designed, humanlike brain into the modified structure of a horse used as raw materials.
WHAT IF it was done the other way.
If anyone did read "Yapoo: human cattle", you might know where I'm getting at.
You don't start from eugenics nor ENGenics, but from dysgenics. Nature, as alwais, provides half of the work already. Think about the joke dog breeds, i.e. pugs.
Raw material could be a batch of pooinloo genetic fuckups with Congenital Genu Recurvatum (pic related)
Then select bad ova/sperm and insert/combine dwarfism, hypertricosis. Proceed by polishing the product with selective breeding and surgery, while causing early puberty with hormone injections to speed up the reproductive turnover of the specimens.
All in all:>move to India>create foundation for genetic study/therapy>hire brony Mengele>acquire specimens>keep some of them happy and well fed/cured as good PR>acquire more specimens from the first batch by "accidental pregnancies" and steal the fetuses masquerading it as late game abortions>what gets in the basement, stays in the basement