Back in the day I built a cradle, it had castors on the front and it would steer slightly with the air rudder. It was a basic rectangle shape, I think I used 4" rear tires and free swiviling 1 1/2" taildragger wheels in the front. The frame construction was 1/4" ply and was glued and screwed together.
For launching I built up speed slowly to minimize torque effect.