What design considerations would there be for a space ship using low-tech bioregenerative advanced life support and propulsions systems?
The ships would be permanently extra planetary and manned by 4-5 crew. All life support water, food, oxygen and propulsion being produced by bacterial cultures (not necessarily the same). With all waste produced ($CO_2$, grey water, waste/spoiled food, organic matter) being recycled through the system or systems.
The ships would not be using high tech approaches but intentionally low tech and avoiding anything that generates or uses electricity, with the possible exception of simple circuits.
The ships and crews are part of a factionalised society, that has retrograded technology intentionally away from high tech, the ships are relics of this earlier time though reduced to shells of what they once were and refitted to support life but not quality of life. Along with the crews, they defend their own claimed space against encroachments by the other factions. As there is little to no manufacturing due to the tech regression, the winners in encounters essentially cannibalise ships and crews for parts to repair/maintain the ships, and crews to feed the bacteria.
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