I think most of what you want to do has already been designed by ARC and produced and sold by Safety Speed Cut.
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http://www.safetyspeed.com/SPM301ScrewPocketMachine.htm
This project was a joint effort between Anthony Lynn (who used to be the President of Castle) and some Amish partners. They designed the product, and contracted with SSC to manufacture and sell it.
I haven't seen one in person, but I understand that it's quite the product. SSC is less than an hour away from me, so I could always make a visit there...