This is a godsend, just what I needed! This "track" is perfectly functional and does what it says on the tin.
The only way it could be cooler is if someone makes an actual GT6-Route X -type of track, with perfectly smooth 12.5 km straights connected with 2.5 km 180° turns.
If anyone ever does this, please let me know. Decoration and stuff wiould be a bonus, but not really needed.