I think...
You just need to plant explosives on assembly line, then move to building A, help us load the loot to the Tank we have and gtfo. I dont give a fuck for guards, and I bet you are able to plant those explosives stealthily even in daylight.
More confrontations = higher probability of being hit. So please, just plant that bomb and come to us in the building A. And be carefull, there is one guard on duty left there...
Ths is not ADnD...there is no exp for kills 
the problem is the people who are working on the assembly line, would you like to kill them too? secondly I can be stealthy as the devil but I need to plant the explosives not just in any corners, but in the vulnerable spots, so I guess it will be visible to the workers who work on them. and i will need more then a few min to set all the charges so luring them out would be pretty darn difficult to do it all the at the same time, if you do not want me to rush the job and probably fail at the Explosives job.
But if you want me to do it at this point then you are free to join me in the main hall, at least be my backup at the door so Sam comes out alive.
i know that this cleaning will not give extra karma, but failing the job will not pay the bills as well.
Sam is good a t dealing damage, not so good at taking it, and I want not dispose my weakness, when it gets hot he will run. So better get him to preform his best.