> using six oval-shaped cars, each measuring 18m x 7.2m holding 30 people
Hmmm...is that 30 people/car or 30 people/6 cars?
You will be enclosed with them on 18m x 7.2m, that's 120m², for 8 days!
The former case would sound like torture, in the latter case it could be done comfortably, though, but it would still require some good nerves by the travellers...
120 m² is a substantial 3- or 4-bedroom house. People endure a lot worse for much lower payoffs than going to space.
In spacecraft, Soyuz is about 6 m³ for three astronauts for two days. Apollo was 6 m³ for three astronauts for two weeks. The Japanese proposal is spacious in comparison.
Hmmm...is that 30 people/car or 30 people/6 cars? You will be enclosed with them on 18m x 7.2m, that's 120m², for 8 days!
The former case would sound like torture, in the latter case it could be done comfortably, though, but it would still require some good nerves by the travellers...