I'm finally getting the fox hide back from the taxidermist that I dropped off almost a year ago. My intent for this fox was to make a full-mask sporran out of him. And possibly a second fur sporran with just a leather flap.

Anyway, can anyone help me with rough dimensions or patterns for a typical full-mask sporran? I've never seen one in person, so I've never been able to look at how it's put together.

Is it just basically a single piece of hide folded back on itself and stitched together? Or do they typically put gussets in it? Is the back usually stiffened with leather?

Help?