Firstly, congratulations for the initiative! I do not know exactly what state is the development , but I would find it cool if this project were divided and resulted in several mods: 1) N-Body solar system: The orbits of celestial bodies would be adjusted to operate stably in this more realistic universe ( planets could be preset and placed " on-rails " inside the game, but I do not know if it is feasible if you need to change the way the game controls the motion of planets ). 2) N-Body vessels: The calculation of the gravitational forces on the ships ( and perhaps asteroids ) would be changed to simulate a realistic universe , which I believe is the main focus of your project. 3) StationKeeping: Mechanism to maintain the orbit of the spacecraft , which will become more unstable in this "new universe". It would be nice if this were done with a new part that could be attached to a ship with the control module and configured by the user (altitude , inclination and direction that should be kept; amounts of fuel and energy reserved for it, etc... ), acting as an autopilot that works "on-rails" or "off-rails" , and even when the ship is not loaded. 4) Timewarp thrust: Allow apply some acceleration on the ship while in timewarp. Also keep rotating the ship in this case... Of course this makes much more sense if these features can be independent of each other! Excuse me for my bad english...