I've gotten the bottom edge bound, and most of the flossing on the bottom. I think I'll have to lower the edge under my arms a bit, it feels too high. And the bottom edge pulls apart a bit. But the fit is a definate improvement, and there's not too much in the way of wrinkling. And I can get my waist down to 25 inches! I still have a bit of a gap in the back, too. It feels like I might have placed the waist tape a bit too high; it feels like it's putting pressure on my floating ribs, and I'd meant it to be just below that, I'm not sure exactly how I screwed that up.
It's using mostly 1/4" spiral steels, with flat steels on either site of the grommets in the back, and a couple of cable ties in the back, too; I'm low on flat steels. I'm pretty happy with the progress, though!
The top edge pulls apart, too. I might actually just cut a centimeter or so off the top all around, or almost all around, rather than only lowering the sides under my arms, perhaps it just comes up too high in the front.
There might even be a coutil version in the near-ish future.