Hey Bigben you should reconsider the new cuts on the center fins, it seriously compromise structural stiffness of your block. If you keep connected the central crossing fins they make the base far more "unbendable", not needing an ultra stiff top. The 18 lbs. of vertical load you are aiming are simply a yoke to copper capability.
I sketched two cross sections of the fins of your block, yust wuess who is more able to bending?
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Originally posted by bigben2k
Did your bulletproof glass work OK?
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Bulletproof glass is just a very thick policarbonate plate.