Suggestion from my side for your game. Let the potential gamers develop things themselve.
Imagine you would plan to make a flight sim. Let the customers (the gamer, not the one who would like to license your engine) make the content.
In Microsofts Flight Simulator, regardless of the version, many people buy it and don´t use the original content. Instead of that, they buy Ultimate Terrain for Autogen Landclasses, Roads, Ground Textures, Clouds, weather generators, add on planes, height meshes and so on.