Lots of progress! I'm happy with most of it but for the head, that still needs work. I didn't account for so much stretching with the fabric so the head pieces aren't lining up properly. I'll need to get some interfacing to help with that. The ears I attached at the wrong angle, so that'll be fixed in version 2.
Salvaged the tail so you can see the shape more. Attached the tail, head and ears, the mane is just pinned on. The mane I sewed in the hair detail, but did not use quilters batting inside like I did with the tail. It still gives the same effect visual so I think I'll skip the batting next time. The batting made the small curves, like at the tip of her tail, too hard to turn out.

I didn't realize just how massive this plush was going to turn out. Pinkie currently stands at 16" to the top of her head, and 19.5" with her mane! And looking how this is turning out, if I want to get closer to Show Proportions, I could make the head even bigger. But I'm liking her proportions now. I'll see how it all looks when she's done.