I want a mod wich looks like this;

The track should be the same as in this video.
And it should look like grass.
Pretty much everything should look like in this video.
The big ball should be white or light grey.
Please make some fences so the ball stays on the track. (Make sure that the ball doesn't get out from the track.)
Please don't be lazy and make something in the air. Make it look like it is actuall terrain.
Don't make the ball go too slow or too fast. I want to be able to setup a custom run atleast.
Add some decorations please. Examples: Trees, bushes, fences.
\!/ Does not have to be perfect. \!/
\!/ It has to be playable.\!/
\!/ It should work for multiplayer. \!/
\!/ No dismembers or fractures. \!/
\!/ The gravity should be -30. \!/
Here's a behinde the scene video;