The improvements included an increase in beam of the main hull to improve the interior volume.

The superstructure was extended to the ship's sides for increased interior volume above the main deck.

It had a habitable interior volume of, and a mass at launch of.

For a given symmetry simplex, a generating point may be placed on any of the four vertices, 6 edges, 4 faces, or the interior volume.

However, due to engineering advances, they have now incorporated more safety features while also providing substantial interior volume, despite the exterior dimensions.