With the vast amount of information out there on total wall systems, I have settled on fiber siding for my house. My two main areas of confusion are underlayment system, and corner board material. There seems to be a great debate between tyvek and felt, and a rain screen system. In the recent clapboard siding article tom had tyvek down, but flashed with felt and made a rain screen type system with multiple layers of felt. Is this or would this be acceptable under fiber? Also corner boards??? Cedar or fiber. Then if fiber face nail or use the clip system. I do have some areas where I have an octagonal bump out. I was leaning towards cedar for ease of cutting. Any help would be greatly appreciated.