>>1842625>>1842609>>1842695making catgirls requires technical knowlege beyond that of what mankind possess right now but it seems inevitable that we will have some kind of catgirl in the future, because it is a concept that too many people find appealing.
the first thing to do is to figure out what you desire a catgirl to be, maybe it's a pet, a toy, a companion, a game, maybe something else; then it comes the techical side of things, it could be as simple as a mind controled mechanical prosthesis to a indroctination process on a new species, the complexity of some of this things is very challenging to say the least... but all things started at some point.
As for ethical concerns i don't thing it's a relevant discussion, the best thing naysayers had been able to do to science so far is to slow down the process and drive it underground; but in the end it's just a matter of time.
study science (engineering, chemistry, biology etc) my friends, maybe having catgirls is doable within our generation.