Replacing gunnel on my canoe (slightly OT)

What kind of _boat_ they use.

Again, what kind of boat, not what kind of materials. Watermen don't generally build boats, they buy them from boatbuilders.

Not going to kick up too bad then unless a vortex off a hill hits a resonance of the lake, then the whole thing can slosh.

Why not? Straight lines, neatly painted.

Define "metacentric height". Yes, it's possible to make a usable boat from a hollow log with no calculation whatsoever. I was under the impression that you wanted something a little nicer than that.

Because you're behaving as if you hadn't.

There's more to it than "won't sink or fly apart in the middle of a lake". If it's motion is so rapid that you're permanently sea-sick or if it's so unstable that all you can do is get it to go around in circles or if it decides to pitch you overboard every time you sneeze that's not good either.