I am also a long time Unity developer and have always had a dream to make a walkthrough like this. I am not much of a modeler, but can do coding and other Unity stuff.
Have you considered collaborating with someone on this? I would love to get involved.
I don't have any VR gear, and work on Mac, so I can't run this sim out of the box. I would love to get the Unity project so I could run it on my mac in the editor at least.