Oooh steel, the build begins today . I'm hoping that's not all mine, I've already got more angle brackets than I know what to do with! Good to see it supporting it's own weight on what it probably about a 3m over hang though, I think this frame might just be strong enough :-). Cheers for to the update.

That's a cunning idea with the bolts asbo (and I like the drawing). Some careful planning would be required to get the bolts in as well as a long socket wrench and some careful hole cutting on the opposite side of the extrusion where it looks fairly weak already.