I have been following the progress of this project for quite some time. I usually find myself having to pick my jaw back from off the floor after each new video. It is truly fantastic.
I was curious as to how one could contribute to this project? I have become a fairly experienced modeler and spend much of my free time fooling around in Blender, which I understand is your 3D Program of choice. I was curious if you would be willing to accept content created by third parties to be included in the engine's world? For instance, a follower might be willing to contribute models and layouts of their home town/city along with detailed local airports, harbors, university campuses, you name it! If everyone with some skills and the right documentation were to contribute something they have unique knowledge about, the quality and accuracy of the world you wish to create would increase dramatically.
I understand you are considering making Outerra open source in the future (at least that's what I have read) and perhaps this is something that could wait for that time. However, I think this should be something to consider as I'm sure there are many people would would be willing to contribute their work to this project.
Again, I am amazed every time something new is released. This project is simply fantastic and I hope that Outerra is well received in the industry when the time comes to integrate it into many various applications.
RTM