Mccrum, That's very interesting what reel said. I was going to chime in and say just use one sheet, all those squares seem crazy! And I would have been so wrong! To add to what reel said, here is a post that I found while researching something else on the site.
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09-16-2009, 09:36 AM
nymack66 
Senior Member
Join Date: Jul 2007
Location: Orlando Florida
Posts: 944
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 ?
So it stands to reason that all those squares in the deck give the proper camber and pitch and at the same time are strong. You can probably cut some plywood jigs to clamp to the deck to give the contour you need and glass it back just the way it was. Good luck!