How do I make bodykits?

I am currently building a Tamiya NSX and I want to make it a model of the Advan NSX shown here:

http://files.automotiveforums.com/uploads/623538car.jpg

The car sits on AVS Model 5 Rims and has an awesome bodykit as you can see. Can anyone tell me how to make a bodykit similar to this and what materials I need to use.

Since it isn't a very curvaceous bodykit, the majority of it can be constructed out of sheet styrene. Use epoxy putty to make curvy bits, and toothpaste putty to fill in gaps and seam lines.

The rear spoiler can be constructed entirely from sheet styrene, and most of the front spoiler, but that should need some putty in places.

Buy some Styrene plastic, Putty and maybe some other materials (whether it be Brass rods, Wire...ect). For tools, I find a Dremel, Exacto Knife, 400-1200 grit sandpaper, ruler and a pencil to be all the basic tools that you would need.

Use the styrene plastic to get a basic shape, and the putty to get a more advanced shape.

With the bodykit that you want to make, I would use the stock front bar (bumper) and use styrene plastic to make the lowest section of the front bar.depending what the stock bumper looks like, you may need to drill the front vents and shape them with putty.

With the side-skirts and the vents on the side, use styrene plastic to get a basic shape and finish off the shape with putty, then use sandpaper or the dremel to make drill or sand out the vents.

I hope this helps, but im sure that Fly on the Wall will be able to give a much better explanation and way of doing it.