Real Time Multi-Developer Level Editing

i have bee working with people on a couple people and have found that for big scenes, no more than one person can work on a scene.

I made an editor script that will let me additively load a level in editor, but ran into a problem starting coroutines in the editor, so i cant tell if it is doe loading or not, and it easy to accidentally load the same level multiple times anyway..

i was thinking if we could make a networking game that gives players the same cam controles as the editor, with a GUI of a list of things they can instantiate, and move/scail/rotate, we couold make a real time multi developer level editor. The part im stuck on is the saving of a level during play?

with someone hosting while still in the unity editor, players would join the currently loaded scene and work with the host to place assets. Any other possible paths I could go about doing this?

and how should i design a parser for making the modifications through a text source?

my first thought would to be to save out any new assets, or modded assets to a text something and have an editor script make the changes after the networking session is over.