Greetings everyone!
I just finished a new Mars Explorer 1.9.7 based Unity 3D project.
It includes the latest buggy model and physics, as well as tons of other stuff - such as the Freestyle world, many of the official Mars Explorer textures, the "smart camera", sample code for in-game level of detail adjustments, server physics sliders, a working MiniMap, and much more.
The Unity editor (published by Unity, not me) comes with a free 30 day trial, and now runs great on Mac and Windows systems. If you want to find out if you are interested in 3D programming - or if you are already learning Unity and would love a sample project, this could be the perfect opportunity!
You should be able to move your terrains and other assets from the old "Mars Buggy" project into the latest project by simply copying them from your old project's "Assets" folder to the new one.
Happy coding,
-Aubrey
P.S. I plan to release a new project once I finish the 1.9.7 buggy physics - but in the meantime, enjoy.