Looks very nice Andy! Maybe a garage mono can be made for the 7 too, and it should be a fair bit simpler than your old man's little beauty, like the elise above. My main worry would be that pesky fatigue problem. I'd hate the idea of thinking it was strong enough when actually the final stress cycle could be the next corner... Not sure about rivetts either, seems a bit temporary for me unless you really know what you're doing (Yeah I know 747s are mainly glued and rivetted!). Needs someone with experience. That ain't me just yet, maybe a retirement project?

oops, supposed to be a reply, forum titles "monocoque"