I'm also a bit skeptical about the skateboard hype. Like, wasn't this what the legacy auto manufacturers learned in the 90s as competition ramped up from Asia, that it really wasn't worth the diversion of having half a dozen barely-differentiated cars on the same "platform" being badged and marketed in different ways (think Taurus/Sable/Continental, etc).
Basically, all the specs that matter will be coming from the skateboard as far as performance, battery life, handling, and so on. What incentive is there to try to build a new box when someone else is making the chocolates?