I don’t have any direct links, but look up Xavier Collos, or go to his webite and watch his videos.
Also, check out Shaun’s new video. There’s a lot of parts with what your looking for, specially towards the end at the bonus section.
About the trick you mentioned. It is possible. Pretty easily too.
Start riding or hopping SIF, then jump off and bring your legs up high, so the seat can move under you, and then land SIB. You could jump up and pull the seat between your legs but that wouldn’t be as hard or impressive.
You can add unispins like you did in that video, or if you want, or are good enough, you could through in the flip tricks with it too.