The plan was brilliant because it was simple.
---------Get the men and weapon(s) in place without raising suspicions.
---------Requisition the sixth floor for the lead-up to the motorcade's arrival without raising suspicions.
---------Any man caught coming down the stairs can say he had a legitimate reason to be up there. All he has to do is get out of the building--------and then disappear. No Depository employee would have this freedom, for his name is on the books.
---------Make sure some Depository manual workers are helping out with the floor-laying project, so they can take full credit for the still-in-progress job that will be in evidence to investigators on the scene afterwards.
Of course, Officer Marrion Baker's dash into the building puts a wrinkle in things. Funnily enough, however, he ends up visiting every single floor in the building-------
except for the sixth. Did the kindhearted building manager (who would have been responsible for hiring the outside contractors for the floor-laying job) improvise a way of keeping the pesky motorcycle policeman off the 'floor-laying' floor?