Most velomobiles have very little storage space behind the seat and to the left/right depending on if the velomobile has a central steering column or dual side sticks. This particular model has the most storage available on the market because of it's quadracycle design (the only one available on the market), while all other velomobiles are tricycles.
This Velomobile is purely pedal powered. It would be possible to add an electric assist, but because this is a quad, once you add electric assist it is considered a moped and loses the right to use bike lanes and paths (in the USA anyways).
Unfolded dimensions
4.511 feet / 1375 mm long
6.299 inches / 160 mm wide
3.445 feet / 1050 mm high
Folded dimensions
3.461 feet / 1055 mm long
6.299 inches / 160 mm wide
2.149 feet / 655 mm high
Supplying your own battery adds to the cost, but it's nice to have the flexibility to pick as much battery as you want or need and to be able to upgrade as the technology improves.