DIY Make a SkyLine (C210) Spoiler

part 1
https://www.youtube.com/watch?v=QC1wtLY832s

part 2
https://www.youtube.com/watch?v=Qe-FO0U46ZU

part 3
https://www.youtube.com/watch?v=efs-x8t-ly4

part 4
https://www.youtube.com/watch?v=byMXZZ1idxU