I'm going the same route on my GP Big Stik 40. I was going to do the tailwheel using either the Dubro bearing setup, or as flyx said. If you look at the rear stabilizer you have approx. 1/2" sticking out the rear of the fuse before the elevator attaches. You can drill a hole in the middle (1/4" out) for your tail wheel assembly to go through to attach to the bottom of the rudder. I decided to build mine with a WW1 theme, and I'm going with a ply fixed tail skid and a wire front gear, and I'm thinking about modifying the wing to place a platform for a pilot, windshield, and machine gun. I'm trying to make it different than most other Stik's at our field.

DG