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If you are going to do the welding on it what kind of tools and equipment do you already have?
Having to shell out for a mig, torches/plasma cutter, tubing bender, metal brake, and random accessories will put you over $3000.
But if you have stuff or access to tools then it becomes way cheaper. So for ~$55 for a 4x8 sheet of 16ga and a bit more for stuff like 20-22ga. Plus some tubing, 3/4 square 20ft long is around $45 each if you order more than one. Lexan varies but can be found for about $70 a 4x8 sheet. Black ABS plastic can be had for around $75 for 4x8 but much cheaper for smaller pieces.
That is pretty much all the stuff you need if you are going to do some fairly sturdy and permanent aeromods. If you plan on cutting into the unibody then it starts getting more expensive and time consuming adding tubing to the car to reinforce it. The tubing can be cheap and really it doesn't need a tube chassis. Just something to stiffen the cut areas and keep the car solid. Square might be easier to work with since you can do away with the plasma/mig and use a chop saw (~$75 for a cheap one) instead.
I would guess probably $500 to chop the top for materials. 100 for a new front end. Maybe 150 for a metal belly pan. boat tail would prob be expensive. It could be combined with the top chop to totally reshape the back end of the car behind the wheels to save weight.
Then if you are going for looks you need some lightweight body filler to smooth all of it out then put some paint on it. So look at probably $500 to make a really good looking car. All the way down to $50 for a gallon of paint from the hardware store and just spray/roll it on the car.
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