
The preliminary designs looked to use an extended version of the pressurized module of the Tiangong space station forward, with a new larger-diameter service module aft, which was evidently fitted with tanks for resupply of liquids and gases required for station operations (propellants, water, oxygen).
Gross mass: 13,000 kg (28,000 lb).
Diameter: 3.35 m (10.99 ft).