This will be the Motorland post then. I'll update it as I'm working on it.
It is 0.83 of a mile, 9 turn road course at the fictional Driving Park facility, home to Test Course, Beginner Course, and Gymkhana as well. The predecessor, Motor Sports Land, from Gran Turismo 2's time trial mode, is even smaller, at 0.55 of a mile, or 888 meters. I made Motor Sports Land into a drift track with Gran Turismo 6's course maker back in the day.
Track width appears to be about 10 meters...
2/21 9:30 pm: Basic wall and texture placement complete.
2/21 10:40 pm: Detailed wall and texture placement complete. First on-track test comes next. After that will be pit stop placement.
2/22 12:09 am: Finished making pit stop after first test. Initial measurements indicate a full 43 car field may be possible. Finer details come next, including elevation.
2/22 2:16 am: Did most of the track.ini work, made the track elevation, and made trkshot.stp.
2/22 7:07 am: Made the LPs, edited the cam file, placed the track surface decals, and did the SPCC sections.
2/23 2:51 am: Finished infield and outfield banking and additional details, made trklogo.stp.