Chevy Volt: Batteries aren't the problem

"...all the other components are electrified as well. [...] There is not an established supplier community for this. It's a very complicated system with known technological solutions. But they've never been integrated in these forms."

Could someone familiar with manufacturing explain why this is a problem? I mean, if there are solutions, shouldn't it be just an issue of fitting them together? That doesn't _seem_ all that difficult, from a complete layman's perspective. Enlighten me, please.