sakimoto,
I remember your previous posts.
What's your intent with this? It isn't practical for self defense from either the using or the legal aspect so are you intending it as making you look crazy enough to deter an attacker or are you actually thinking about using it in the home. If the latter, I think we've pointed out the many negatives on that. If the former, you're looking at nearly the same set of problems as well. If you're just looking to make a "toy", RC pretty quickly answered that by suggesting you just cut a bat on a band saw or chop saw and glue and screw the bits together. You risk getting hurt with such a toy, but that's obvious anyway.