Fit Bridge to the top. The bridge should fit the top without forceing it to conform to the domeing of the top. To force the fit will stress the top and inhibit sound production. I prefer to fit each bridge individually to insure a good joint and a top that if free to vibrate. Bridge materials commonly used are ebony or rosewood, rosewood being the most common type used for classical and flamenco guitars. My preference for the angle of the grain of the bridge is vertical or slightly angled. Cut the bridge blank to the size given in the plans and ½” or more in thickness, the extra thickness allows for fitting to the top. Put a piece of paper on the top and scribe the arc on the bridge on both sides