I'm too much of an independent thinker to want to thrust myself into some sort of group dynamic situation. Yeah, I could be a leader, but I don't want to baby sit people.
I can travel faster with less noise...err...flying under the radar ...by myself. I have been through Air Force SERE. I know what it is to be without food for days on end. I know what it is like to have to land nav at night with just a map and compass. I know what it is like to have people after me in the middle of the night.
A bunker is only as good as its ability to resist a Molotov cocktail.
Do yourselves a favor....next time you have an empty glass beer bottle, fill it with water, go out to some field and throw it as far as you can.
That is the distance or the killing zone/range you really need to be worried about. Big whoop if your favorite "sniper rifle" can shoot dime sized groups at 100 or 200 yards. You'll need to be able to stop a "zombie" dead in their tracks with a lit firebomb in his or her hands from about 50 yards out.
A friend's husband wrote a book on an S hit the F scenario. Jeesh, I can't remember his name for the life of me, but I heard from his wife that they moved into a log cabin. That sounds like a fairly good idea for surving a bunker or hunker down situation. The logs are thick enough to stop most pistol bullets. If they were really thinking, I hope they went with a metal standing seam type roof and for real operating shutters, preferably made out of metal.