Very simple sculpture design, but new at concepts.

[EmeraldFalcon]

This is a very simple design, I don't fancy myself an artist or a sculpturist. I have a design that looks roughly like a fattened shark's fin. My project is modifying a car. I don't appreciate or buy into purchasing $500+ fiberglass body kits and having them epoxied and bolted to my car. I would rather do it myself, but am unsure of what methods would be optimal.

My design very simply consists of ridges that steadily grow in height from the front of the hood to the back of the car's cab. The front ridge will be about 4 inches high, the back ridge should be about a foot long. I'm thinking 6 or 7 ridges would do me just fine. I already know how to anchor these ridges, and I plan on sanding/priming/painting them with the rest of the car. My question for y'all is merely what I should make these ridges out of that would be relatively cheap, not involving specialized equipment, and would withstand highway speed wind-resistance.

[Merlion]

Fiberglass is a suitable material for this.

I don't mean to damp down your search, and I may be wrong. My view is that if there really is something else that is "relatively cheap, not involving specialized equipment, and would withstand highway speed wind-resistance", this would already be made used by others to produce and put on to the market.

[fused]

There are many ways of achieving these fin additions to the body of a car but the most important feature will be how they attach. Fiberglas by itself will not remain securely connected to steel parts, you can screw, bolt or rivet a fiberglas "base" to the body and work from that foundation.

Any core --wood, foam, fiberglas cloth or woven roven, etc.-- can be the armature foundation of these fins to stiffen/support the shapes. The biggest factor is your experience and how much effort you want to put into these body modifications. It's definitely a doo-able thing and your sweat equity will save a big hunk of money when compared to paying pros to do it.

Simplest method that comes to mind? (1)Make the fins out of wood; (2)attach them to the car body, screwed/riveted and epoxied into position; (3)apply a thin layer of fiberglas (with mat under cloth), feather in edges and rough sand; (4)bondo inconsistancies in the surface/shape; (5)final sanding and prime to prep for finish paint.