Hi Ken, here are some related videos for techniques you can use for car modeling in MOI:
https://www.youtube.com/watch?v=7QVzpOOHtIw
https://www.youtube.com/watch?v=PcQX02Jcx6A
https://www.youtube.com/watch?v=g_VZjSgLhdg
https://www.youtube.com/watch?v=NcP_GH36qTY
https://www.youtube.com/watch?v=UC7o2qLj0yA
https://www.youtube.com/watch?v=BgDanUBKt1k
https://www.youtube.com/watch?v=KK1VoyydSIs
https://www.youtube.com/watch?v=xr6WBeHbzK0
https://www.youtube.com/watch?v=2l7Uxwxzfik
https://www.youtube.com/watch?v=F0Fn0PUocJU

But car modeling is a quite difficult and advanced area of modeling. If the tutorial you link above is just what you need then it would probably be easiest for you to follow it using Plasticity.

- Michael