You could do the same thing with two nuclear submarines
And it would make almost as much sense.
The basic "tether" trick has some merit, but maneuvering a pure tension structure would be a bitch. If you're going to go that route, I'd build a rigid "dumbbell" with a habitat at one end, a long truss structure, and things like nuclear power systems, batteries, etc. at the other end. Propellants and expendables should be near the middle to avoid imbalance problems.
Assemble it in orbit, and off you go.
The "little centrifuge" idea like we saw in 2001 has problems when people actually try to live in one. Spinning for "gravity" works better the larger the circle and the slower the spin velocity.
