I took my first five Z-Tower Maps and I stacked them on top of each other. Drove the whole route to make sure that it works, but author time is set to be a bit slower. This won't be easy to beat.
If you want to use the Heightometer Plug in, change the Map UID to wCY3WqfggAVRDJpc9AMJRYFCqK and set the height to 1812.