Well, As I looked on the rear suspension, it looks really like a semi trailing arm (basically the cinematics from the piccolina's rear suspension). Also, the front suspension would behave closelly enough to a double wishbone setup. As I said, it doesn't have to be perfect. Neither the vanilla ones are, lets say that you adapted the rear suspension from the picollina and the front one from the pigeon. With some finetuning, it will behave realistically any way. Trying to make the suspension the closest possible to the real thing will make you get stuck with a almost ready car with no suspension. As you said, the suspension is on the way to some improvements, so try to think like an engineer and simplify your work. Almost nobody will feel the difference between a well designed double wishbone and the exact representation of the maluch front suspension.