if you have a plainer and or a jointer you can mill the wood into just about any thickness you want. a plainer would be ideal for this where a jointer can be dangerous for any use other then squaring edges. something you can also do if you have a band saw is rig up a jig and use a couple inch thick piece of wood and make 1/2'" thick pieces from it and then use a plainer to take the pieces down even thinner.