You can reuse the dashboard trim by cutting off the part of it that goes between the radio and A/C controls. It looks much more professional with it still on the dash.
While I can appreciate your knowledge and expertise, you gotta focus on what the video is about. Almost 7 minutes in before you get to the radio installation. And then you completely skip over pics or video of the cutting and clearing space behind. That's what I'm looking for in diy videos. The details! What will I see, what do I cut, bend, etc.? Show me!