Rewritten for clarity??
...That is correct. The entire fin is sheeted, then sanded. This is one of those occasions when "Sigment", or sandable glue should be used. To review the way I handled the fin, on page 3, (post #56), this is what I said about it, and why I felt it is one of the trickier parts of the build. If you look at Ed's fin, you can see not only the L.E. is shaped, but the "truss area" behind the L.E. piece is shaped somewhat to an airfoil shape, producing a relatively thin vertical fin for such a large plane:

To me, the fin, (and especially the rudder), is a little tricky becase at the base the finished, sheeted fin is 3/4" wide, and at the top, (tip), it is 1/2" or less depending on taste. You have to shape the fin from bottom to top, and curve it from front to back to give it a Kaz-like airfoil shape. Ed didn't build it as a 3/4" simple slab. You can see Ed's looks relatively slender at the top, and rounded/tapered at the leading edge.

Rather than just sheeting the structure, you may wish to shape the fin as described above, and taper the truss in the building process, because the sheeted structure can be sanded only so much. I am just describing what I did, (for better or worse). I wanted my fin truss pieces to support the sheeting...that's why I tapered each piece. Notice the oblique view...you can see the tapering. Once one side is shaped and sheeted, you can flip it over and shape the other side some before sheeting.

If you look at Kevin's fin compared to mine, I don't believe Kevin sanded it as much as I did...it's a matter of taste, and the "look" you are trying to get. If you look at the finished fin detail of my prototype, you can see where I actually sanded through the fin sheeting at one point, and had to add a little wedge of 1/32 ply. I wanted the fin with a nice airfoil shape. The widest point of the fin roughly corresponds to where the filler material is.

Duane