Space Colony Art from the 1990s
Photo: Bryan Versteeg/spacehabs.com  Interior view from near the hub of the settlement.
Space Colony Art from the 1990s
Photo: Bryan Versteeg/spacehabs.com  Automated robotic farming.

Kalpana One is intended to improve on the free space settlement designs of the mid-1970s: the Bernal Sphere, Stanford Torus, and O’Neill cylinders, as well as on Lewis One, designed at NASA Ames Research Center in the early 1990s. These systems are intended to provide permanent homes for communities of thousands of people. The Kalpana One structure is a cylinder with a radius of 250m and a length of 325m. The population target is 3,000 residents.

Link to NASA. Link to spacehabs.com.