Ive's got a bunch of latex gloves and glue, and recently access at the library to a 3d printer (for any "generic" parts, like tubes other bits).
Only thing is I don't have any dolls or anything to build this on (and would feel awkward buying them, being a guy). That and I have no time right now. (but perhaps soon?)
If you're going to glue pieces of rubber glove to a doll and inflate them, why not glue some covering over the joints first to prevent leaking, rather than faffing about with baffles and shit?