I had idea for such game, but it was meant to be realized as a 2d space sim. If you want your ship fleet to survive during logoff, you need to hide it somewhere

I had idea for such game, but it was meant to be realized as a 2d space sim. If you want your ship fleet to survive during logoff, you need to hide it somewhere in deep space between star systems (via series of semi-random jumps so no one tails you, unless they put stealthy tracker on your ships) or in a defended space station with some automatic defenses. You can design and make any ship or station you want, you just need to have enough matter for fabricator machines plus they take time and resources to build/repair. You have a hundred star systems with physically correct size and resources, plus lightyears of empty space between them.