A manned orbital space space laboratory would be able to operate for several months without resupply. Basic Garrett-AiResearch systems could be slightly modified to meet requirements for environmental control, life support, cryogenic storage, power and attitude control for both the command module and laboratory.
Artist Concept depicts a Gemini Astronaut, wearing an AMU during Extravehicular Activity EVA. An umbilical tether secures the Astronaut to the Gemini Spacecraft. The Agena Target Vehicle is used for Gemini rendezvous and docking maneuvers