Creating a magnetic vehicle (like F-Zero) (2)

Hey,

I'm on a new school and have to make something interactive (a game) and I would love to make a game like F-Zero, I'm a 3D-Modeller so I know this is quite hard to do with physics.

None the less I found something about it right here on the forum: http://answers.unity3d.com/questions/3251/creating-a-magnetic-vehicle-like-f-zero

I just tried that script to get this working on a box and a track and make it float but that didn't work. The var idealPosition was missing or something.

Maybe I'm already starting with the hardest part but what would be a good way to power this vehicle? I only know how to work with WheelColliders and I've made stuff like

if (input.GetKey ("w"))
transform.Translate(0,0,5*Time.deltaTime):
Ect...

This probably isn't the best way, as we're working with physics right? As I said my knowledge of Unity is very basic and I'm beginning to see the logic in JavaScript now.

Could somebody here help me in the right direction?

Best regards,

Edwiersma