Thanks for the replies gents. Sorry I couldn't get back to this thread sooner. I've been thinking of putting 2 extra thruhulls mounted a couple of inches up from the cockpit sole, (above the existing scuppers), one on each side of the tiller shaft/post. Each connected to identical ones through the transom. It's not like I'm likely to be shipping a lot of green water on a regular basis, but I like to be pepared.
Thanks for the input,
Joel H.