K'nex coaster car design ideas - I need some!

[eBen]

If anybody has any ideas or instructions for a K'nex car that will run along rails then please let me know!

 

None of this new generation, pre-made, rail hugging, more realistic stuff please, i want to make it from scratch out of K'nex with room to fit Lego riders on it OR a miniature camera. (How else will i see the spinning tunnel in full effect??)

 

I am going for a dark ride and have used up what little originality i have on its concept and what will happen to the car. Any suggestions?

 

I will make the track fit the car but it must be able to be pulled up/along a chain. The track can be altered to the width of the car and if there is room to add a shell which will enable it to float all the better! (but not expected. I think ill just let it partially sink and waterproof the camera)