[Fat Charlie]

Building any company from nothing takes a lot of time and capital. Using preexisting parts and designs where possible can save a lot of steps, allowing the company to have something to sell.

Elio didn't bother to design and build swivel chairs for his office. He didn't write his own office software or design software. He didn't grow his own coffee beans for the break room. If he did any of that he would have been dismissed as a lunatic.

But he isn't using off the shelf turn signal and marker lights, is he? Nooo, he had someone design them fresh. And he isn't considered an idiot.

He's identified a niche that isn't being filled. He could cobble together something to fill that niche and sell it at a profit while developing the one that does it best- and the early buyers would be happy to upgrade to the new one when it comes out. But he doesn't want to fill that niche- he's making his money without having to produce anything.