Thank you, In that everything in mine is different except for the outside shape, and I probably will have a round boom too, ...... the bulkhead drawings for me are NA . There is the statement in the build notes...about the vertical fin is so similar to the horizontal tail that there was no need to discuss it.... seems to me to say that the rudder is +/- 30 degree too like the elevator....I figured I would check though as I believe you might have read everything on your site because I have not. When I layout the rudder horn as drawn against the boom, the horn hits the boom at no where near 30 degree/ more like 18 degree, but my boom layout is different too.