RE: natural wood color filet
Dave,
Next time.. Do all your filler work before you glass the fuse, so that your filler is under your finishing resin/glass cloth. All that is used on the Vortex to install the tail and finish it is, Z-poxy finishing resin and micro balloons (white).. The finishing resin turns it a little brown in color, and by the time you glass over it and paint the clear.. It looks faily close in color. And as you probably figured out, that balsa top block piece that runs between the tail.. is tricky to make. getting it to fit so that the need for any fillet at all is the trick.
Don't sweat it too much.. sand it all smooth and paint it clear.. and go fly it.
Looks like a SuperT Vortex tail :-)
RB