Chris,
Did you get your design from a Black Widow or a Brown Recluse? Seriously, aren't you afraid of all that weight up that high in the car? Hope you've got some outside mirrors, 'cause that one in the middle won't do you much good.
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The competitor in me says I should be worried about the extra weight and the placement up high, but the Dad in me says, "No worries, mate!"

Outside OEM mirrors are generally useless I have found (although I am leaving mine on). I like the Longacre 17" mirrors as they seem to have the best optics. Just a tad behind the Allview mirrors I had in my last car. Truly the best just can't find them anymore.

With the Longacre, I can generally see from the right side of my helmet to outside the passenger window. A small convex mirror on the left down tube takes care of the driver's side.