ummm, not sure about other boats but on my 84 H14 the shrouds are attached on the side of the boat with a "bar" that is under the lip of the hull, not inside. So unless you just really want to install an inspection port for drying and storage you shouldn't need to do that to tighten up that connector.
Or are you talking about something else? Nothing else is attached to the inside of the hull except all of the rudder side attachments and of course the posts for the frame.
1984 Hobie 16