Sorry about the skewed photo, I find it really hard to photograph these so they look square (well, rectangular).
Despite all my problems with tension, I have finished the quilting on my diptych, apart from a couple of minor adjustments that I'll make where an appliqued piece is not sitting down enough ("Sit! Stay!"). Generally, I'm pleased with the results. I'm also very pleased I'm not exhibiting a bed quilt - it's taken me several days on and off to complete these two - the larger one is only 27" by 23", and the smaller one 29" by 18". That one, incidentally, is sized according to the Golden Ratio - the aesthetically pleasing proportion that abounds in nature and the human form, as well as being widely used in art and architecture.
Now to bind them, and then onto the next task.