Now you mention it I remember seeing your build over the summer when I started seriously considering building a CNC. I liked the design so it probably stuck in my mind. Hope you don't mind a little creative borrowing :-).

Out of interest what size box section are you using under your X-axis rails? I'm guessing it must be 50x50 as I've just noticed that the rails over hang on the design I posted above. Did you find that the box section was straight enough for the rails without any flattening?