A banked edit of the default Martinsville is actually a really simple idea that works really well. As someone that's made a lot of tracks for NR, this is EXACTLY how I learned to make tracks -- simple, basic edits like this.
The only reason I'm not giving it 5 stars is that the dat file isn't packed, which is a bit of a pet peeve.
The setups maybe aren't perfect for the track, even though I'm hardly one to complain about that since I'm pretty guilty of that, too.
I would like to offer to fix those and some of the other nitpicks I have with this track (the scenery doesn't look that unique, but that's a personal preference that did not affect the review).