I am actual thinking about doing a pony sci fi story. There is a good one already though: awakening by solocitzen. My story is still in it's early planning stages. Have been having problems though designing the equestrian civilisation. Especially considering all the different races that inhabit the planet and how they would live and work together in a single civilisation. Especially things like sport, government system and military. How would all the races be able to work together in these areas. Also what would you call that civilisation since equestria is only the pony country. Also if you want to imagine a more modern equestria I would recommend fallout equestria as it does a great job at creating a more modern equestria.