Here is a view of our torpor-based, artificial gravity inducing Mars transfer habitat. This features all the same systems, technologies, crew complement (6), and margins as our baseline torpor habitat module - however - it is able to rotate about its main axis.
Depending on the rotation speed, gravity fields ranging from 0 to a full earth-G can be experienced by the crew. With the crew in torpor, we don't have to worry about uncomfortable gravity gradients and coriolis effects, so we can spin faster and with a much smaller radii than possible with a conscious/active crew. The total gross mass for the habitat is roughly the same as the baseline.
Nice job from Mark Elwood at SpaceWorks Studios for illustrating this option for us!