I suppose that depends on the scale and printer. I wouldn't count on shapeways to do that, they seem to stick with the more simple stuff. You can hollow but make sure you don't make it too hollow, it has to be a certain thickness and I think it's based on the material. I think the best thing for you to do is get in contact with a printer or a couple and see what they need and do your best to provide that. I don't know any sorry