This piece of timber was amongst several pieces that I bought from a dealer on eBay, and I've been absolutely delighted with the quality of the stock - it cost me £35 for 3 @ 14" diam, 1 @ 15" diam and 1 @ 8" diam, so this piece cost in the region of £7.50. It's finished at 13.5" diameter x 2" deep overall, with a few coats of Danish Oil.
It has moved just a little, but still sits well, without any tendency to rock, so it's fine by me. I usually place my platter face down on a flat surface in my office with a weight on them for a couple of weeks....it always seems to result in a flat rim!
C&C always welcome....Les