I was trying to make a Hawaiian ipu drum out of a gourd grown from a seed I planted that was marketed as a "birdhouse gourd" and dried this winter. I've been looking up what ipu drums are made out of and apparently it's supposed to be a calabash. I consulted the Book of Knowledge for calabash and it didn't reference a use as a birdhouse.
Recently I talked to some gourd artists and they didn't seem to know what a birdhouse gourd was, so I'm guessing I'm just calling it by what it was marketed as, not necessarily what it is. So, I'd like to know, how much variation is there in the calabash variety of gourds and what kinds are good for birdhouses and what kinds are good for ipu drums?