Round bag -- turn both sides?

[DJole]

I am working on a round bag, with tooled front and back, soft gusset and zipper opening. (The bag is about 8 inches diameter, and the zipper is 9 inches.)

I've got one side completed, and now I'm looking at the geometry, second-guessing the idea that I can actually sew the other side on and then turn the whole thing inside out through the zipper opening.

Here's are some photos of the bag so far:

I am betting I'll have to get the sides wet so they'll be flexible enough to bend through the zipper hole.
So, is it possible to make this a fully turned bag? Or is this going to be impossible?

Edited January 17, 2022 by DJole

[DJole]

Here's a picture of the inside: 

[bvdv]

 

Maybe a bit late but those piping allow you to turn the leather, they act as a hinge. So sew inside out and turn. Hammer that piping to give a crisp edge.

Bvdv