Very impressive. A couple of questions.
1. Is the bass track a mix of fretted and fretless or all fretless? All of the fretless instruments I have played sounded like garbage with percussive techniques like slap and hammer ons. Some of the percussive parts have some obvious fretless work as you can hear the mwaw in the glisses; some parts sound like fretted.
2. One of the fast sections sounds like he is using a percussive technique or maybe even pick, but in the video it looks like he is using finger style. Take a look at 3:29. Is this just a matter of doing fast two finger pull offs with the plucking hand or is he slamming the stringers down similar to single thumb technique? IME the thumb tends to bounce naturally so the strings ring out, but the fingers do not. Perhaps he is pushing down through the strings. I have been working to integrate 2 and 3 finger pull offs with double thumb, but no why I could sustain that tempo for an extended time.