IMHO... 3/4 is WAY too much! with ply and glass combined, keep it under 1/2" with a few 3/4" stringers... definately arch it at least a little..
Your electronics box can be structural... a 4" high 1/8" sheer panel ( the back of the box) can be VERY strong
one layer of 3/4 with glass, stringers, and proper engineering would easily support you AND a volkswagon
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