Excellent work! One thing you might consider is hollowing out the hole for the rod on the model, it will cost less to have it printed, and it will also ensure that people drilling them don't get the hole off center. Alternatively you could put a dimple in the center there, to at least give people a easy way to get in the center.
Any plans to make the model public so others can get it printed?
I've redone a part of the pinbot visor assembly. Swinks has done a lot as well.