The overlay is skived to zero edge on the "V" portion so that it will lay completely flat on top of the inlay. The entire front of the sheath is 2/3 oz. with the windows cut out and the inlays inserted beneath it so that the edge margin there will be very thin as well. Then this entire piece is overlayed onto 7/8 oz. cementing flesh to flesh so the interior of the sheath is automatically top grain lined as is the front. Then the stitching is applied around all the window edges and then the Chevron overlay is applied and stitched. This whole assembly is then tooled, carved, or emblellished to choice, and by doing so you are tooling on the equivalent of about 10 oz. leather so stretch is not a factor. That 2/3 oz. chevron even though very thin tools like 10 oz. also. The back piece including the loop is also 2 ply with 7/8 and 2/3 so there is nothing but top grain showing anywhere on the sheath. Not really very hard at all, but I do have all the equipment and machinery to do a quick and professional job and that helps a lot. I'm not sure I'd even try it hand stitching.
My standard finish is neatsfoot oil, followed by Feibing's TanKote and then Tandys' NeatLac with levelling and drying between each operation.
Paul