Eddy, I'm not sure how difficult this would be to machine, but couldn't you cut down on the overall thickness (and weight) by reducing the thickness in the middle and increasing it near the end where the G1/4 openings are?
Something like this?...
Code:[Side Profile] ______ | | - GPU 1 \ | | | | | - GPU 2 | | / | |______| - GPU 3
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