I started building this with the intention of building a longer grass slide map.
Sadly in the old Trackmania have been many limiting factors like grass only on the bottom layer, you basically had to slide to a road piece if you wanted to create a longer map which was very inconvenient, only flat grass etc.
Now these limiting factors don't exist anymore and we have much more creative freedom to build maps where gs feels much better and is much more consistent.
Took me much longer to build than what it should have taken, because I still had to get used to the new editor.
It is not a pure gs map, there is also some normal driving.
I mainly used the grass block set (of the map editor), so every road is a grass road. Make sure to not steer when there is a gear shift.
I took some time to create a scenery. Now you can feel like driving through nature... in a stadium.
I put thick poles in front of the gap between the finishes, so it is very unlikely that you will miss it and you can't end up in between the finishes.
tl;dr
It is a 1 minute gs map.
Have fun!