Darn good tooling you did an amazing job its very nice work i cant do letters lol. On your question a welt in a knife sheath is to protect the stitching it doesn't have to be an inch thick to fit the guard that's not what its intended purpose is but like all things hand made you can make it as thick as you want and i wont tell you your wrong by doing so. I make my welts the blade thickness at the most. Now on holsters i make a short tapered welt ,sometimes, because a revolver cylinder is much wider than the barrel but even those aren't an inch thick.