I have been running around the freakin Corvega assembly plant for an hour now. Can't seem to clear it. I have been above it and got the bobble head. Cleared the perimeter. Whenever I go into the plant, the quest marker points to some invisible point above, but I am at the top (inside) level? As soon as I leave the plant to go higher for the quest marker, I am pointed inside again?

Find the white elevator door. There will be a set of stairs to the right of it. Should put you back on track, I had trouble finding this too.

I'm also having the same issue...I swear I killed everyone been running around this place for like an hour+ to no avail. When I go into the big double door entrance and go into the corner I can see red dots and when I shoot they are alerted but I almost swear there's no way in, could you give a better explanation of where to go??? I feel dumb

I will try to find a white elevator door with stairs next to it.
Thanks for now.

B*

I found it!

The way to the top (of the inside of the facility) is in the very center of the local map, maybe slightly to the east.

Look for an elevator ( as someone said above) and a WHITE ARROW pointing up to a set of stairs.

It is easy to miss. There is also a red Nuka Cola machine at the same stairs. It is in a rather narrow corridor.

Hope this helps anyone.

B*

Yeah the place is a huge maze.