Streetbeast stuff is not highly regarded by knowledgable rodders. As a result, they have poor resale value. Everything you do to the car will cost the same as if you'd started with something good, so the little you might save with the initial purchase will be blown in extra work and expense trying to make something decent out of it. And it will still have the slightly askew shape, and low value that is inherent in Streetbeast. And don't fool yourself into believing that you won't be selling it someday, you will, and that's when you will regret the choice.