I know it might be a stupid idea, but would it be possible to have liquid propellant/oxidizer tanks perform double duty and serve as living space while underway

I know it might be a stupid idea, but would it be possible to have liquid propellant/oxidizer tanks perform double duty and serve as living space while underway? The fuel here is methane and oxygen, nothing problematic. I know the shell is very thin and only maintains integrity due to pressure but it would still have to be pressurized to 1 atm for the trip and wouldn't be subjected to forces once in space..