Discussion of the idol/worship aspect is not relevant to this item. I think the western idea of the act of bowing to something is vastly different to the eastern idea. I look at it as just a form of honoring or showing respect to (in this case) a physical representation of the ideal and memory of the founder of the art. It is NOT an act of showing spiritual reverence to an item or person. Just as you may give up your seat for a woman, shake hands with a person you meet, or even removing your hat during the "Pledge of allegiance"; these are nothing more than physical actions to show respect or honor to another person, or memory. Side note: my father who is an ordained minister made the Kamidana for my brothers school, so he must not see any spiritual undertones to the object either.
Brian, I think it a beautiful Kamidana. Probably the nicest I have seen. You should be proud to hang that at the front of your Dojo. :asian: