Like it's been said, your previous articles give you some juice and a commitment from one of those magazine contacts to cover it again go even further.
If you want to be taken seriously and look professional, you need to have a rendering and a solid cover letter along with an accurate estimate of completion date. If that date is SEMA, you absolutely need to hit it or you may owe some vendors money. Other vendors will credit money back to you if you're successful because of flakes who have gotten sponsorship and never had their cars see the light of day. Don't be one of them.
Communicate with sponsors during your build promoting their product with something like a build thread here and send them links, photos and updates every month or two to show them you're working for them before the car is even debuted.
The other big thing is to get the car placed at SEMA and tell sponsors where that will be even if it's after they sponsor you and also list all the places the car will be seen and the shows you will attend which is how you will earn your sponsorship.
Good luck!
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