Basically, just tie an oversized hare's ear with good segmentation in the abdomen. Use vinyl rib for this. You want a good contrast in size between the abdomen and thorax. Do any of the following depending on the amount off time you want to put in...
Biots, rubber or split a hares ear tail for the tail and/or antanne. Pick out the legs, use hen, partridge or rubber for the legs. Some people tie in three wing cases, but I wouldn't worry about it. Thin skin or your standard turkey should do it.