I'm in agreement that northern passage is HH LR is Canyon Wreckage not sure about OWB
In the video it looks like the Mojave Drive-In (south of Nipton) has that big eye on the screen. There's a rail spur leading to a train tunnel (visible to the south from the drive-in). There's a similar tunnel nearby, south of Camp Charlie, which may be linked.
The WIKI comes right out and says this is the access point, but you know the WIKI.
I agree -- Northern Passage for HH (tomorrow!), Nipton train tunnel for OWB & Canyon Wreckage for LR.
BoS bunker seems like an odd choice, now.