The black Raider handles remind me more of the grips on a Star Wars yoke than they do Tron joysticks (the blue ones look great though).
Could you use two Raider grips instead of the PVC and RadioShack button handles in the TwistyGrip plans? I'm imagining cutting a mounting/wiring hole centered on the left side of one grip and the right of the other, and just plugging or ignoring the hole in the bottom where the joystick was.
Paint all the PVC black, and maybe add a black plastic box over the center, and you could make a pretty convincing looking (besides feeling) SW yoke.