I have finally found the prototype of Synthtrax and got it pictured! According to the marking on the car,it's the 4th made of all 4 of them. It consists of 3 pieces ommitting the wheels. Both the glass and the grill are painted onto the body. While the wheelie bar is painted (molded) onto the chassis. Last but not least,it used a kind of wheel specially designed for this casting.
I am having difficulty with creating a new page,if you are interested,please do me a favor.