On the matter of House Vance, I right away thought of Hugo Gernsback (after who the Hugo award is named) when I saw the name Hugo Vance, even though I'd not picked up on the earlier Vance references. Hyannisport MA, home of the Kennedys seems to be the influence in name, if nothing else, of Lannisport. I also have to wonder if Gerald Dayne and his sword Dawn are in fact mirrored off of Michael Moorcock's Dorian Howkmoon nad his Sword of the Dawn.