Birchwood sheath for my little hadseax

The sheath I made for my trusty little hadseax does not keep the knife in as well. Now it´s a great knife and I want to carry it, so i decided upon making one out of birchwood burl. Nothing unusual, I just made the outer form with axe and knife and some sanding paper, split it in two by batoning, hollowed out one side, glued the mess together and riveted it with a hollow pin (not on the photo). Now I will make a leather upper with a flap or something more fancy;-)...