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Yes, you go ahead and send them your money and see what you get for it.
You realize that 99.9% of those websites that claim they can build you a car are just a scam, right?
You asked me my opinion on what a build would cost and I told you based on my experience. I have (like many others on this forum) built a completed car, and I built mine for dirt cheap compared to what others have spent or invested in their builds. I did all the labor myself and I still spent close to $50K in parts and material. Anybody who tells you they can build one of these cars for less than $75K is just trying to steal your money.