In the second half of 1972 and first half of 1973, simultaneous with other work, TsKBEM began technical development of a Multi-module Orbital Complex (MOK). The MOK was designed to solve a wide range of tasks: astronomical and astrophysical research, materials research, navigation, communications , remote sensing for study of forestry, farming, geology, fisheries, etc., and military applications.

The MKBS would control all of the linked orbital systems and provide base quarters for the crews, an orbital control center, a supply base, and servicing facilities for on-orbit systems. Independently functioning spacecraft would dock with MKBS for repair, upgrade, and refueling. The MKBS would co-ordinate all of the autonomous spacecrafts' activities and maneuvers, resulting in a unified transport system.

The development of the MOK would been undertaken in two phases: An experimental phase (near earth orbit around 51.5 degrees) and an operational phase (sun-synchronous orbit of 97.5 degrees). In May 1974 the N1 was cancelled, and with it, the MOK.

SOOOOO, modules, as always.

Core module[this craft]. It have gun from Almaz station, but you can't use it if something docked to the forward port

Power module
Dock it to the forward port of core module.

Artificial gravity modules
Dock 2 of them to the rotating section of power module. Make sure to transfer all the fuel to other modules, otherwise the station may fall apart due to imbalance

Docking module
Dock it to the aft port of core module

Research module and special module
Dock them to the top and bottom ports of docking module

special and scientific equipment module
Dock it to the aft port of docking module