i asked for permission to copy the f-hole pattern too,you are more than welcome to use any ideas or designs that you find on any of my work,thanks for the compliment of picking out this design to use.the tobacco sunburst was done with real tobacco mixed with h2o and applied with a piece of foam.as far as resonator design applications i have used lots of different things.for the most recent resonator designs i have used flat metal plates bolted to the top of the box from the inside of the lid.i have used tin metal copper metal and brass metal for the most recent plate resonators.i like the tone of the brass the best,for a great spun cone in brass--- look for a guy named Old Lowe from texas,he is a member here and has brass resonator cones for sale at a great price.very affordable at 25 or 35 bucks with 2 size cone options---a 6 in. cone or a 9 in. cone.the cone application mounts to the top of the box and is a great design. thanks again,hope some of this info gets you good results with your resonator project.