I don't feel there would be any significant loss of structural strength from the extra holes, but to be sure, one could easily rivit in a cover strip of lauminum and utilize all existing holes to strenghten the ribs.....I think
would be considered just standard "doubling '' repairs. The weight gain would still need to be considered ( tho not very much weight )---and less than the metalized STC, for sure. Harry Francis 93530 Blacksburg, VA.
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