Here's my take on it, stretched version of the Aero Template, bottom does angle up slightly from front to back, have not been able to get my head around how to create some down force during max acceleration then have it go back to neutral nearing top speed to allow maximum speed. But it's a start. The Catamaran thing looks like problems to me. What I have drawn is more a test sled than a mini "Car" since we aren't going to be putting anyone in it, why bother making it look like you could. A starting point perhaps in the direction of a clean small aero shape.
