Video at https://www.youtube.com/watch?v=UZACpAACUuo

Instructions available at

https://rebrickable.com/mocs/MOC-148996/thirdwigg/bmw-e30-cup-car/#details

https://rebrickable.com/mocs/MOC-148993/thirdwigg/bmw-e30-sedan/#details

https://rebrickable.com/mocs/MOC-148992/thirdwigg/bmw-e30-touring/#details