Logan,
reading your comment, I can only say that you obviously lack the knowledge and experience in this field. Yes, a good woodworker may be able to make a raw TSUKA or a SAYA, but making it the original Japanese way is a completely different thing! While a SAYA may 'only' fall apart or scratch the blade, an incompetently made TSUKA is a potentially dangerous thing and may lead to the 'House of the Flying Swords'!
There are seven different expert craftsmen involved in making a Japanese sword, and I think it is over-self-confident to believe that any craftsman in the West could do the same. Experience in this field is a main factor.