Dehulling Machine Needed!

 I've grown a small amount of Emmer wheat with the hope of planting more of it next year, or potentially as a crop to over winter.

Its proving difficult to hull though. This isn't threshing - this is the act of removing the grain from it's protect hull - something that is a lot more suborn on these "less developed" grains.

Does anyone know of any open source plants to build a dehuller? Or seen a method that works well by hand. I'd rather not use heat as want all the seed to still be viable.

Currently thinking I'll get an old hand grinder and create rubber plates for the seed to rub through, which should take the hulls off. Although I'm open to suggestions!