Hi I'm a new comer to the craft and have a new project, I have made up a design, up where the front faces of the bags are two layers glued and the flap cover is the same. The layers will consist of backing layer 3 mm BLACK Veg tan and dress face 3 mm GREY/GREEN chrome tan with pull up, after gluing what will be the the best way to finish the edge, as they are two different types? I would like a high quality solid black edge if possible . In addition prior to gluing I want to put mushroom dome studs just through the finish chrome tan layer around the edge so they don't show on the inside. I am not sure whether to use decorative head rivets or normal prong studs what are the pros and cons.