Summary Thanks for the excellent summary Helmantel. With all the tests it was kind of hard not to get lost along the way. Even though some components added nothing to torsional rigidity I'm sure they help in beam strenght. The only part I have little confidence in is the SFC x-brace. It didn't add anything in my tests and I can't see it adding very much to beam strength. I think the idea is sound but it just doesn't seem to work.