Chapter 2 is made out of level 11-20. In the videos below you can find a pretty accurate solution for level 11-20. It can be difficult to recreate the exact same build, so try to make small adjustments to make it work.
Credit for the videos goes to
Andrei LucaLevel 11
Level 12
Level 13
Level 14
Level 15
Level 16
Level 17
Level 18
Level 19
Level 20
[Edit on 24-09-2019 - using new videos which should make it more clear]