We started installing the metal brackets on the iBeam rafters. We have done the back and front walls. We are using hardened nails, 38mm long ring shank for extra grip and zinc plated! The nail gun has a special nozzle to allow Stephen to place the nails accurately into the tiny holes in the metal brackets! But even then a couple of times, the nail missed the hole and bounced off! But one actually punched a new hole through the metal and hammered the nail into the wood!
We then nailed up small pieces of 18mm OSB fillers on the webbing part of the iBeams over where the middle wall is. This is because the metal brackets needs something to fix on to. Very fiddly work, going up and down ladders etc!