On my '77, the liner ends about 4-5" from the hull, giving access to the toerail nuts and stanchions. My stanchions are mounted so that 2 bolts go through non-cored deck along the edge, and 2 bolts go thru cored deck. Stanchions have backing plates (1 plate per 2 bolts) but they are really undersized and I intend to replace them with larger plates someday. There is some flexing leading to gelcoat cracking but they are structurally solid. That is a common problem. That is also a common site for core saturation. Later models have stanchion bases that mount over top of the toerail. That is, I think, a better solution, and could always be done if the deck is a problem there. The later model bases are still available if you want to retrofit.
1977 C&C 30 Mk 1 hailing from Port Clinton, Ohio