I've seen a clip that shows under the skin.

It's compressed air RCS. The compressor, regulators and a ton of hardware take up the entire space from the seats back to literally the very last inch of the car. Hard pipes run along the door frame for the forward RCS, meaning only one person (driver) can sit in it and enter from the drivers side. Huge carbon RCS tanks fill every other space.

No idea how long it would take to recharge the tanks after venting them.

There's no room for 'car' stuff in it.

Interestingly there is a big... sleeve of wizard... that extends down under the car to assist the ground effect fan. Packaging that and the RCS stuff into it is a real engineering feat.

But it didn't look to have crash structures, or any other production ready hardware.

I think everyone is getting too caught up in the Thrust and Rocket variants. There aren’t going to be very many of those. But the base model will just be a regular Tesla.

Sounds like it was just compressed air (rechargeable on the fly). Impressive if true.