Hi,
I just wanted to know how much can the game be modded? Can someone do a total conversion mod or implement an entirely new game mode or a game using the assets?
Hey Veer. Yeah the dev kit is open to many aspects of the game. I have been working in the Beta team for a few months now and we have worked with the devs to expose a lot of the main content. A few things are still hidden but we have great communication with the devs in our discord channel. Please see us there for more information. Here is our official DnL Wiki.
If you have any more questions please see us there. 
Darinius417