Civil war bayonet scabbard stitching question.

[Ross5403]

So looking at the leather kits from ACW kits and the cap pouches and cartridge boxes seem pretty straightforward. I was wondering about the bayonet scabbard on how that stitching is done and still be form fitting for the bayonet? Anyone ever done one of these or made any triangular bayonet scabbard? I have some leather working experience but seems a little more advanced.