Mmm, how many people (among those not talking about Mods) are actually aware of how 3D Custom Girl plays? The huge breast sizes in that promo vid is just dumb marketing thinking they have to set the size to huge - you can slide it right down to Petanko.
Having said that, I dropped 3D Custom Girl for other 3D titles which give me more things to actually do, as well as giving the girl(s) some actual lines to develop some basic character. Dressing up girls as characters didn't have much appeal to me and can be done (with mods) by the other popular 3D titles too.