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I'm actually making a sandbox game that happens in a space. Only thing that is preset is the Races. They will give you a certain skill set and starting equipment but the player can learn and get almost everything other races will get. Only things players can't use are other races Enviroment Suits, they are class specific.And to take this even further, there are no levels or experience in traditional rpg sense or no stats the player need to raise to be able to use some items (but the player might need some skills to do so.) and so on. There are however lots of skills that you can learn and get better when you use it, others are gained just gained. I guess thats where the game progress is measured from as every rpg needs a way to do so.
Basically in the one i'm making you have two preset races. Then from there players will choose what they want to specialize in as their "favored" stats and skills. But they can still learn them all. And there'll be "premade" classes that a new player can choose if they have no idea what they're doing.