I rebuilt my roof for 150 MPH winds, or for the zombie-near miss tornado. It is 22 gauge steel, white color with 85% reflectance. The seam is H150, 1.5" tall seam, folded over. The hold down clips are spaced every 8" on a plywood deck covered with Titanium Wrap 30.
To mount the panels I had to choose between S-5! and Tra-Mage. The Tra-Mage clamps won out as there is considerably more compression holding the clamp to the seam. The company matched the competition for price, and powder-coated the clamps white. My panels will be raised on 6" square aluminum brackets so there will be more air to cool the Enphase inverters and the panels. My first 10 panels are on asphalt, and the power curve is obvious that 3" spacing is too close and hot. Here's the link to my application.
The Tra-Mage clamps will be used to support metal conduit on the roof between the panels. The panels are 18" and so each vertical row of panels must "jump a seam" to work with the size of the panels.
I refuse to put a hole in the roof to bring the AC and lightning surge directly inside the house. Instead, I'm looking for inspiration on how to make a conduit run over the side of the roof look nice, and follow the wall down to the interface box. The lightning rods and main conductor system will take a more direct path to ground, not relying on the conduit to handle that surge.