Hi a question for the devs: Are you planning to release an integrated Map Editor or external Map Editor? Would be awesome, since I see there a huge community potential. ^-^
We haven't discussed a map editor yet. We do have some internal tools that help with making maps a much easier task, but I imagine we'd still have to do quite a bit of work packaging that into something that saves and loads at runtime, rather than in the Unity editor, and giving it a usable UI. I'm sure we'll chat about it when we're all back together!
I am no professional, but maybe you can serialize a class with a save pattern for each entity (In this case buildings and streets as simplest) and then you could save the object into binarys... ( using System.Runtime.Serialization.Formatters.Binary; )
like: [Serializable]
class SaveEntitys{Entity[] ListOfEntitys [...]} [Serializable]
class Entity{public Entity(obj object, Vector2 position, obj content)}
Sounded like you haven't thought about it that much, maybe this is a way to go? :3 Maybe you have even already other structures, which leads into the problem, that this "path" of saving won't work... ^-^