Thanks, Mr67Stang. Usually I sort of work out design features as I go. I see things in a built structure than don't strike me on paper. Adding shear webs half-way out is a good idea.

skaliwag, what do you think of this? I like the sub-fin better than the blue line, myself.

Remember, this is still a work in progress so I'm all for incorporating improvements that anyone thinks of.

Thanks, David