I used your door removal video and have a few tips for others.
Tips:
- Leave the window (glass) up or down.
- Leave the 2 cables connected and just place the interior door panel leaning up against the door.
- Remove the 6x9" speaker housing with the 6 1/2 speaker attached by disconnecting the speaker wire clip to gain access to the inside of the door panel. Now one can add sound dampifer material behind the speaker. Check for window clearance with the glass in the down position. (This improved the sound from the speakers)
- Do not add sound dampifer material pass the interior door panel clips.
- Temporary tape the thick mass load damping material prior to premanently gluing it.