I tried that one before trying to make mine, and found the lines to not be close to real life (very wide lanes, for example) and they had those random tarmac patches (though found out one could easily fix that by just select all objects and move). Mine is still not as close to real life as I wished in terms of track lines, and might not be the as good for racing as lane width can be a bit claustrophobic at times.
I can add yours to first post if you want. This can be a thread for all Tsukuba layouts out there.