There was a guy who ported a nice Sue model from a Japanese modeler to Source Engine .mdl format - I'm not sure how easy it would be to take either the Source engine model or the one from the japanese website and work that into a VRChat model, but it could possibly be easier than doing it from scratch. Just mentioning it in case it helps.
making your own is better anyways ... before someone comes and is like "omg ya stole this from there" >..> + ya can add unique stuff like putting your own signature onto it that ya know its yours like choobie does it owo she on her own has her chars without it on the cheek but friends or ppls which downloaded it from the VRchat character search have all this choobie signature o3o https://prnt.sc/vdallp
making your own is better anyways ... before someone comes and is like "omg ya stole this from there
