thought to inquire about if an Arachne race was something others might be interested in.   in testing it would look something like this    at this time it's just a concept but given the centaur race se not only works and now provides a Resource for doing this type of race    the centaur se resources, lets you pull an upper half from you default body and applies it connect into a lower half mesh. the lowerhalf pulls animations from the horse animations tied to