From memory they used a wagon or Statesman front cut and a ute or tonner (depending upon which you were building) and mated them together. Doors were front rear halfs joined to wagon/statesman rear front halfs. Chassis were 2 x van chassis joined together as vans were a dime a dozen in the 80's, and you'd buy a whole V8 Sandman van for pocket change. I remember a red one where they'd made it a cab-chassis but had made a well back by using a back out of a ute or van and putting a front on it. The concept was basically like an SR5 Hilux dual cab.