The size is the same as the other two. The only difference is the fact that the second one was styrofoam, glued with rubber cement, which ate away at it, and turned the upper part into mush. The thick leather is tough to get flat around corners, without wetforming. But I think I may have an idea.
The wood that I use is slightly too small to get the exact dimensions for a core. BUT, this leather is about .25" thick, so if I glue a piece of it to the sides of the wood block, and use the thinner leather over that, to better hide the edges, it would look much nicer.
Right now, that third one is simple a cardboard shape, made from a cereal box, with a piece of the thick stuff on the 2 sides, and the single flap folded around the front/back section. So you can see the cardboard in the gaps. Stretching a thin piece of leather over the sides would keep the gaps from being there. But the thin leather I have is that same stuff that is used on the second pouch. So you have that dark leather again on the sides. Unless I really scuff it up, OR paint it, just like the vinyl.
I might try another one of these tonight.