Saw airport ground crews use light wands similarly.

What if @simonmorgan is right and we NEED to factor in MONTHS for custom parts from the start?

Totally feel that echo comment. I've ducked into a few closed malls, and first thing you do is scan for cracked tiles near old fountains. Those spots are always weak from water damage. Bring solid shoes because broken glass is everywhere by the empty stores. If a railing wobbles even a little, don't lean on it. Heard about a guy who fell through a fake ceiling panel trying to get a cool pic.

Friend of mine had a close call last year that still makes him cringe. He was doing his usual walk around, giving each joint a visual once over. One bracket looked fine from his angle, but a kid on his crew actually got down and looked up from underneath. Found two bolts you could spin with your fingers just hanging there. Makes you wonder how many things we only see from one comfortable spot, right? Now he uses a small paint marker to put a tiny line across the bolt and onto the metal. If the line breaks, you know it moved. What do you use to mark yours?

Ever make those signals official after they worked so well...