Musk noted that vehicle would be just as wide as the final Starship at 30 feet across, but it wouldn't be full height.

This isn't set in stone by any means. However, it suggests that SpaceX is optimistic about its ability to complete the vehicle quickly. Musk and COO Gwynne Shotwell had previously pegged the first short-hop flights for late 2019. That target might be achievable -- people near SpaceX's planned Texas launch site have seen parts coming in. If there's a larger question, it's whether or not the test program will move briskly after the first test flight. SpaceX has talked about putting Starship in orbit by 2020, but a lot has to go well for that to happen.