If you look at some of the pictures that is wood on top of the perling. They are replacing the wood with tubing. There is one section that has already been replaced. If I had to guess when the tornadoes came through in 2011 it messed up the roof.

The tubing is 14 gauge so it's not heavy stuff all 3/32 rods, but if I can get my mig on the lift I may go that route. Your looking at 1" welds.