...this implies a leading edge that then widens before tapering back down, like the wing.... YES THAT'S BASICALLY IT....IMO.

It's up to you. If you'd prefer a more "airfoil shape", no need to rebuild from scratch, but depending on what you are happy with, you may want to re-sheet the front section of the fin after sanding to make it thinner...Look over page 3 for the general fin shape, (remember mine is the original fin that was later changed, but it should look similar). To me, it should not look like a wedge from the top, and be wide and blunt from the front IMO, but as you can see from the pictures of Kevin's Simla, Kevin's fin is thicker up front so it's a matter of taste.

When you sand back from the L.E., you may go through the sheeting before you find the taper you want, but that's OK. Sand until you have the shape you want, ("airfoil" or not), then resheet the front of it if you have sanded through it. I have found that balsa filler helps a lot at times like these. You may also choose to simply round the L.E. if you'd rather not do all of this...it's up to you.

I don't have any really good pictures from the top...hope these help...if there are any remaining questions, feel free to send a PM.

Duane