Hindsight is great, but I think if it were me in charge of the installation; since the cut-out portion at the top is the weaker portion, I would have had a 2 x 4 clamped at the top to reinforce that part, with a guy on each end to grab the board to help assist with the lift and positioning. Might have helped, or maybe not...who knows ? Plus, I don't think they had enough manpower to do the job safely.