| Woodsaw, I would think that you would get very little shrinkage in the length and thickness of the slab, mainly in the width. But what you would want to account for is extra thickness to machine off to true up the board once they've dried. They probably won't stay perfectly flat and will have to be jointed. 4/4 stock generally starts off at 1 1/8" thick rough, then 15/16" when dressed S3S and usually 3/4" when finally used. So with your slabs I wouldn't make them thinner than 2.5" if a finally thickness of 2" is your goal. The removal of a 1/2" of wood isn't gonna speed up the drying process a whole lot.
Dave 
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Honestly Honey, that will cost around $100 $150 $200, and I need a few more tools.
Heard from a client..."If I had your tools and experience...I could do it myself"
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