I create a design, and copy it on printer paper - as many copies as I think will be required. I cut along the patch box edges and glue the paper to my brass with white glue. When it has dried, I use a jeweller's saw to cut along the lines and then clean up with files, creating the draft that will make it possible to inlet. I don't use anything less than .40" thick brass now...thinner is more difficult to inlet well. I love 1/16" brass, but still inlet it flush with the wood...leaves lots to dress down to the wood to create the perfect job.