The most logical place for the Cbuttons would seem to be right below the display. I'd suggest having the sliders on the first pair of "wings" that come out, but maybe make them thinner? The second set of "wings", the ones with the transparent areas, don't particularily appeal to me. Too much space without a lotta functionality makes people click on something else. Also, I think that vertical text can't be done yet, but don't quote me.
Nice work so far tho, keep tryin!!