I have several thousand feet of conduit and ~300 10"x10" boxes to run on 1/4" thick steel walls. Any ideas on how to efficiently mount the boxes and supports to thick steel like this? Drilling and tapping would take too long. I also thought about maybe welding some strut onto the steel for supports, but that would also be a major additional cost. I'm thinking of possibly using a battery-powered Hilti gun to shoot the strut up, but that doesn't seem ideal to me. Has anyone done something similar to this?