The QAYG method I tried was like this:
https://www.youtube.com/watch?v=L_b9...ufiU7jAzBjlt7K
It's a long boring thing to watch all of what she says in the multiple videos. There is only a short portion addressing what to do with batting that is not the fusible type. I did what she said, and had horrible results.
I think this method would only work good with batting that can be ironed very flat, and probably only with the fusible batting like she used for any
good results. But, I felt, what is the good of batting if you are going to flatten it? I didn't want to iron mine flat into a piece of felt, and that was my mistake.
Quilting my center panel went very well. Then I tried to attach one side (my top was in 3 pieces), and the puffiness of the center made it so that the seams didn't match up with side top, so my points didn't match. Because the top was quilted to the back, stationary, attached to it, and the back was cut with the grain, I couldn't ease in the top anywhere, it was stuck being exactly the size of the back. I got that side quilted, but was so disappointed in how the top went together.
Then, on the other side, I decided to make sure my center was very flat, and then the top seams matched up well, but the back ended up being very puckered. I actually made darts in it to take up the extra fabric.
I thought it was very hard to control attaching something puffed up with batting and quilting to something that was ironed flat.
No sashes though! :-p