I would like to build a Walnut top for our kitchen island later this summer. This island does have an electric cook top but not sink. I've began to start thinking about purchasing some rough sawn stock for this project. I'm wondering what would be the best final thickness for this top. I'm guessing somewhere between 5/4-8/4. The finished top dimensions will be approximately ?x42"x84". I would like to construct the top from some boards about 6"x8'. What thickness would you suggest?