Re: Dell Quay Dory Grabrail
Don't know Dell Quays well, rbro, but I do know that their construction is similar to my beloved Boston Whalers.
Based on that I would expect to find only foam under the outer fiberglass hull moulding except where optional features may be mounted.
Can you drill all the way through the gunwhale and put anchors under? I have done that when mounting bow trollers on Boston Whaler 13s.