I would be inclined to glue a teardrop-shaped piece of 1/16" ply or basswood on both sides of a cutout for the tailwheel. I'd make the cutout for the wheel plenty big above, and fit a form-fitting bottom plate. A simple pin (tubing would be good enough, or just 1/16" piano wire) would be 1/2" long, if you go this route. I'd sure look for thinner tailwheels, tho, or might make one out of Delrin rod.
Probably not a good idea to hinge the rudder on this setup, just minimal rudder offset. I'd drill the hole in one side, install both, and drill through the second. Double drill, to make them a tight fit, perhaps burnish to size with a hunk of wire in an electric drill. Leave the wheel off until painting is done, then install it and the pin, and add a drop of CA to each side, followed by a drop of paint. One side could be made blind, by covering with a bit of FG or CF with a longer pin installed (a 90 degree leg for torque should help get it loose).
I got a new laser cut RSM Tucker kit a month or so ago. What a pretty design!
I'm having a little trouble figuring out a color scheme, tho. I think it should be pretty simple, so as to not distract from the beautiful shapes. Please post pics of yours...
Steve