I am in agreement with the guys here, If you cannot locate any aluminium bars you can consider using a 3/4 plywood to fill in the entire area resin it to the inside skin and use longer bolts with washers, all the stress and weight is condense to this inside skin pressing outwards, it will not hurt to add the ply, If i remember correctly every 3/4 ply with mat and resin on it gives you 1500 lbs of support in a 3'x3' square ?
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