Tell us about yourself!
Only two points here. Please cover your porch underside. Wasp/Hornet/Bees WILL make their homes in your open space. One simple word to cover your roof problems. 8/12 roof trusses. Less expensive than your method and much stronger. If open concept is desired, just add some cross ties at the top of your rafters approx. 6 inches down. Either way, when building, use 7/12 or 8/12 pitch with your metal roof. Problem solved.