New skip found by Albinohat, but I optimised it and made this video. Skip saves 12s compared to old route. For the door rider glitch you need to make sure you don't do a doorclip, instead keep the open door button pressed all the way until the door is closed and also keep pressing run button. You will see if it works by turning, if you are partly through the door but can't get trough it like in door clip, you have done it.

Then starts the hard part, hugging the wall without getting too far from it at any point so the player hitbox won't expand. Take the first little wall slowly up to the corner, then you can jump the next little wall to reach next corner. At this corner turn so you can run, then start running and look behind, this prevents you from being pushed out of the wall. You will hit a pole halfway, go slowly around it and run again while looking back. Next you hit the lock/chain on the fence. Again go around it and walk to the next corner. once you are past it you can pretty much run the rest of the way.