Dave,
I believe that most of the Shihan come to the Hombu but many
of them just come to train. I do know that the following
Shihan teach at the Hombu Dojo, Nagato Shihan, Seno Shihan,
Oguri Shihan, Noguchi Shihan. Those are the ones that I
know for sure. However there are other Shihan who are
fairly close Shiraishi is in Kashiwa and it is fairly close to
the train station but also fairly confusing to get to. I was
fortunate in that someone led us to his Dojo. Good luck and
look at George Ohashi's website for further details. George
can also probably answer your questions about times better
than anyone else, if he is available. He helped alot when
I was in Japan on my last trip.
Brian R. VanCise
www.instinctiveresponsetraining.com