This is may be too late and I'm not sure if it would work for you but here is my plan - I am getting some 1" diameter fiberglass rod from McMaster-Carr and am cutting it to match the thickness of my transom core (I'm using 1.5" Coosa). I am putting those short pieces of rod everywhere in the core where a bolt goes through (tab attachments, platform bolts, etc.) before I glass it in and redrilling afterwards - these make compression columns so that the core does not get crushed and they seal the core off from water. Where my sterndrive goes through there will be a 12"x24" solid fiberglass plate in the core before it gets glassed in - for the same reasons. At first I was only going to use the rod on the bolts there too but I want the extra stiffness around the drive hole.
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