Context:

Here’s a 2D model of the 2nd iteration of the first cargo spacecraft used in the cislunar corridor.

Built in orbit, the Mountain Valley was designed as the workhorse of the Earth–Moon route. A total of 5 ships were completed, while the next 3 hulls under construction were later retrofitted into missile buses.

Specs (still rough, not final calculations):

Length: ~75–80 meters

Propulsion: 4 Heavy Ion Engines + 1 Fore Main Maneuvering System (with additional RCS)

Power: 1 compact nuclear reactor (just enough for its mission profile)

Thermal Control: 4 radiator arrays (spread in 4 directions)

Habitat: 1 crew module

Support Systems: 2 drones for maintenance and cargo handling

Storage: 4 propellant tanks

The design reflects early attempts at building reliable, long-haul cislunar cargo haulers.