Heading back to my favorite spot to get this challenge done.
I get my tried-and-true Nissan Skyline GT-R V-Spec II again, upgraded to S2, although any all-wheel drive car upgraded to it's full extent should work. Head to the fields directly east of Yarra Valley Horizon Festival. Basically just drive through as much of the field as you can and try to hit the hills for 'Crash Landing's and 'Kangaroo's, and pull off E-drifts along with regular drifts and you should build up enough skills in succession to get an Ultimate Skill Chain.
I also unlock the #Forzathon Original Drift King - Complete any S14th: Redux Challenge to win the Nissan Silvia K's '94 completely by accident. Was going to post a solution for that as well but I can't find out what the S14th: Redux Challenges actually are but I assume if you basically do what I did here you should unlock that challenge as well.