If you are flying off grass, you do not need the tail wheel, a skid works just as well. Be careful where you mount the main gear when you convert to the tail dragger version. Have the axle about one inch ahead of the CG when the plane is held level (tail up in flying attitude). If you get the gear to far forward, landing will tend to bounce badly unless you make a perfect landing and will be difficult to keep on a straight tack on takeoff; to far back and the plane will tend to nose over during taxi.