I've posted a bit about this finished top on my blog, but thought I'd save my reflections on working symmetrically for here. In a word, it was hard! Much harder than I anticipated. The difficulty lay not so much in the method; after all the rules of log cabins are quite simple and I'm not an idiot. It was more that I never got over that desire to mess it up. Not in a "oh no, this is a disaster way", rather that I was constantly battling my natural urge to disrupt the pattern.
The compromise I reached, which just about kept me on the straight and narrow, was that I started piecing strips from mismatched fabrics, or joining them with little insets of a different colour, or used a strip both horizontally and vertically. I also threw in those little wedge bits and the more random flying geese as I headed out towards the edge. To be fair they were a pragmatic as well as aesthetic decision, since I was running low on fabric by then.
Am I glad I kept at it? Well yes, I am rather, since in the end there's lots about this that I really like. Will I be looking at more symmetrical work in the future? Not any time soon.