Looks pretty good, and mostly makes scientific sense.

However, I don't know why anyone would build colonies on Venus and Mercury, since on Mercury hospitable temperatures could only exist very near the poles, and Venus destroys robotic probes within a couple hours (Not to mention that launching a rocket from Venus would be extremely difficult. The thick atmosphere would create massive drag forces.

Colonies orbiting Venus might be possible, but I don't understand why anyone would want to build them there, since there's plenty of perfectly good empty space at Earth distance or greater.