A simple chunk of wood around 25mm thick is all you really need for a chopping/serving board and offcuts are ideal. Over Christmas, our No.1 son mentioned that he didn't have a cheeseboard in his flat, so just after Boxing Day I had a rummage through one of my offcut boxes and found a 250mm square lump of quarter sawn oak. By the time I'd planed each side with a finely set BU smoother, shot the ends square, done a stopped chamfer on the underside at the ends and generally tarted it up (which included a coat of Food Safe Oil) I'd spent about 40 minutes at the bench. The best woods for serving boards are those which don't impart any possible 'taint' to the food, such as sycamore, maple and beech and they also look hygienic to boot - Rob