Center Spar Upgrade

Is there a reason why a whole NEW center spar structure [instead of the existing 0.040"]cannot be made from 0.063" 6061-t6 or 2024-T3 with a couple of extra lightening holes and reinforcing with the spar uprights 6-ZU-2-4.Seems to me to be a better option and a lot less bits. Cheers Alan

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