Okay, so here's how you make a cat girl. Don't genetically modify a girl for cat like features. We can't do that yet. Selectively breed humans to give you a young girl with anime like features, and raise her in isolation so she trusts you and only you. Make her think animes are examples of how people really behave. Formulate a strict diet and exercise plan so she's always in the exact physical form you wish. Humans have a "growth hormone". Excess of this causes giganticism. I'm absolutely sure c by denki