Good point again, Ace10.  I missed the keystone, and it's a must-add for "structural integrity".  Definitely going to incorporate that.  I think Airflamesred was referring to the "pole' of edges created by the use of a pole sphere for the dome.  However, i think I need to use the sphere in this case, because I intend to duplicate the look of the "stone seams" you see in the photo example of a similar structure.  The flow of edges on a sphere are perfect for duplicating that look, whereas a quad sphere wouldn't have the tapered flow of edges to create that look.

I'll update it later tonight with another screencap...

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