Here is a marking gauge I made from poplar and padauk. Padauk is bad about bleeding and the sanding dust spreads like a virus, as you can see in the end grain but it is hard and attractive and should protect against normal wear and tear. The iron is a hex key, cut an inch shorter to match the depth of my drill bit and the short side of the "L" cut and shaped into a bird's beak on my GP hand grinder. Maximum depth is around 2.5 inches. The fence is glued to the handle but there is a threaded insert that runs through both, locking it in place. It takes very little pressure to lock the blade securely. The design is a bit unconventional but in testing it cut extremely well, much better than pins or wheels, and the blade did not twist or flex.