hello,
i don't know if the latest thinking is any different than 60-90's thinking, but here is a link to a foil that would work pretty well for a rudder. http://marlongofast.tripod.com/zipped_aeronotes/NACAfoil.htm
6% may be a hair thin, but a naca63 series foil will be good for rudder and board.
keep in mind that hand shaping may not yield a perfect replica of whatever foil you are trying to shape. if you find the ultimate foil to replicate you would need to use a cnc machine to create it if you want valid test results for that particular foil.
you can make templates for the foil you choose to check a hand shaped blade.