Forget rockets for moving a planet. That is ridiculous. You'd have to expel huge amounts of mass in the opposite direction.
The advantage, and necessity, of moving a planet or some other planet or moon is that you get your raw materials. The planet is your raw materials and gravity creating mass.
So to move Venus, up 30 million miles, against the gravitational pull of the Sun, you are probably talking technology that is able to generate artificial gravity. But at that point, it seems like it would be better to use that technology to simply mine the materials you need to create the environment you want, in a space station like environment. I'd favor a cube like arrangement for space distribution advantages. A spherical arrangement is unnecessary if you can create artificial gravity. Mine the materials out of Mars or Venus, carry them to a near earth orbit (for convenience of being near - technology that can create artificial gravity can certainly do cosmic ray shielding), and build away.