[Greene]

I ended using vinylester resin. First I rounded all the corners/angles where the transom meets the bilge/hullsides with thickened resin. After I put a layer of 1708 and 1.5 oz mat on the transom skin to beef it up. I installed the new core and then I used 3 layers of 1708 and 1 layer of 1.5 oz mat to form inside transom skin. I then tabbed three overlapping layers of 1708 at the angle where the transom meets the hullsides. It feels plenty strong, especially after installing the stringer knees, but I haven't hung the motor yet as the project still continues.

Do's and do nots....
-I wish I made the transom opening smaller, but instead I just made cutout from the old transom.
-Get grinding disks from an autobody shop.
-AND round the top edges of the transom core with a roundover bit on the router before installation. This will allow the glass to over top edge of it much easier, ie glass doesn't conform well to 90 degree corners