I have been asked to build a large dining table,46″ x 120″, with a thick top. The base is to be painted black and the top finished natural with tung oil. The trestle base is no problem, but she wants a slab top of cypress, about 2 1/2″ thick. In my area there is no such thing as kiln dried stock 2 1/2″ thick. I can get the cypress as air dried but then it is about 15% MC. I can easily install the top to float and take care of the shrinkage by locating it with 2 pins in the middle and let gravity hold it down, by my math the top will weigh about 250 pounds. But I am concerned about controlling cupping. have any of you dealt with this problem?