Hand-Stitched Leather Watch Strap Commission

I am looking for a skilled leather worker to hand-craft a single wristwatch strap from scratch, built to the exact lug width and wrist measurements I will provide. The case has 20mm lugs and I would like the finished band tapered to 16mm at the buckle, so the piece needs to be cut, skived and shaped rather than assembled from a generic pre-cut blank. Material should be a vegetable-tanned hide roughly 2.8-3.2mm thick for the top layer, backed with a softer, thinner lining leather so the strap sits comfortably against the wrist and does not feel stiff during the first weeks of wear. I would like a lightly padded construction near the lug end for extra comfort, with the padding tapering out toward the buckle so the strap does not look bulky. Stitching should be genuine hand saddle stitching with two needles and waxed thread, not a machine straight-stitch imitation - even, tight spacing along a pricked guideline, with the stitch line set back far enough from the edge to avoid tearing. Edges need to be beveled, sanded through a few grits and burnished to a smooth, slightly glossy finish, ideally with a natural or beeswax-based edge dressing rather than paint. Hardware is a separate concern: I need a properly sized buckle and two spring bars fitted to the lug width, plus a keeper loop stitched in the correct position so the tail sits flat once worn. Please include a brief plan for how you will confirm sizing before cutting the final leather, roughly how many days the hand stitching will take, and photos of comparable straps you have made previously so I can judge stitch consistency and edge finishing quality before we agree.