I'd start with a dumbbell shape - two pods connected by a slender cylinder just large enough for a man to travel through, and rotating like a pinwheel. One can

I'd start with a dumbbell shape - two pods connected by a slender cylinder just large enough for a man to travel through, and rotating like a pinwheel. One can add more "spokes" over time to complete the wagon wheel. Or even just one pod with a cable and a counterweight.