This brings up another question - if I understand correctly, you will remove some steel "extenders" from the to-print / correct shoulder harness attach points and order the correct-length harness to get webbing all the way back to the attach point. Question is, is a longer length of webbing preferred?

In a presentation at one of our recent chapter meetings, the person presenting reminded us that there are THREE impacts in a crash - your butt hitting the seat when the airplane contacts the ground, your body hitting the belts as inertia takes over, and your internal organs hitting the inside of your chest - as inertia continues. I'm not sure if that series of events points towards longer belts are better, but the two airplane designs I have built/am building put the harness attach points way far back in the structure.