Various plugs for in use space leak stoppage. Tear kit for irregular shape also.
Secondary habitation use of propellant tanks once in place such as Mars. Concentrate furnishings that can be plugged together in the tank..
Special sleeve coupler to risers that can be removed when needed to act as entry point for habitation. May be able to pre-install buss bar for feeding furnishings. Secondary benefit is accessibility to shell for leak repair.
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