My suggestion would be to keep the strength of the design internal to the hull.
1.) Glue a wider internal edging as described (with sufficent width to glue to hull - screw up from bottm to attach plywood base for cap).
2.) Glue (hard as nails) foam on top of plywood with fiberglass columns previously discussed to provide support in three locations.
3.) Cover with biaxial for strength then a fine weave to smooth apperance making a clean seem line with 1" overlap to the hull on the exterior.
4.)Cover cap/hull seem line with rubrail of your choosing.
Kamikaze
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74 V20 CC with a 150 Johnson (Gone but not forgotten)
89 V20 Cutty with a Tower (Build in process)
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