My main quibble with multiple moons is how they would affect the tides. Writing about sea voyages would be hard to figure out if there never was a low tide or neap tide, etc. Also, would multiple moons throw the 24-hour cycle out of whack by the gravitational pull affecting the rotation? Maybe if they were small moons there would be no problem...I dunno. Then there is the orbit path...wouldn't want the moons bumping into each other and gravity would pull them closer together over time...especially with different size moons. So much to think about and I'm nowhere near smart enough to do the math...I failed college physics 101. A model would most certainly be useful and a neighbor kid I used to babysit works for NASA so I'll ask him if he comes up for the holidays.