Modding Alpha dinos

I decided that I would like to try messing around with modifications to the Alpha dinos of the game, particularly the Raptor, but I can’t seem to find any of the files for them. Would the modifications have to be somewhere in the normal raptor files somewhere, or some other files that apparently I’m overlooking? Or is the dev kit not yet up-to-date enough to be able to mod with Alphas? Sorry if I’m just simply overlooking something, but I’m still relatively new to both modding and this game in general.

They are named MegaRaptor and MegaRex.