Looking good.
If you shorten the liner a little more, it won't bunch up as much in the middle when folded. But the downside of that is it won't lay flat when open. At a guess, I'd take another 1/8" to 1/4" off the length of the liner. Since this is only from a photo, it's hard to tell how much it has bunched up, but you can tell better than I if you need to make any change.
You do great work.
Tom