The Hatori header should be #552 if your running a YS 45 FS engine (which you should!!)...
http://shop.singahobby.com/?q=node/18127
Boy that thing looks really nice Pete!!
I see a nice looking scale dash leaning up against your back wall in the first shot...Oh..That may be for the .60 size plane cause it looks a little big for the .45...