I would guess not since if you don't have the Wild Wasteland perk then it's not there. I'm guessing they put it there just as like a land mark for people to look for when they want the Alien Blaster and it kinda fits how the Aliens got there.
Doubtful, probably just get blocked by invisible walls or something. :banghead:
If that happened I would just use the "noclip" command to walk through the "wall" but I want to climb the cliff legitimately. Not just fly up using the noclip command.