The sounds in the video are actually in the pack, just under a different name. They are called LongTubeHigh, Low, ETC. To make them work ingame, just change out the LongTube part for Grave Digger on all the files.
I will give you 2 reasons why you cannot do that.
1. I did not give you permission to do that to my track.
2. If you want a true replica, then you should have someone model the arena and then make the floor and proper textures.
Whether or not it is your's...if would probably still be way way to laggy to run in Rigs Of Rods. Sketchup models of that caliber are usually very high in vert content.