Just a few ramblings here for you to consider. Plywood with a vernier of your choice I got out of that "Everything needs to be solid wood syndrome" a number of years ago. You will get a better finished product and much more stable. As far cupping or warping if you insist on the solid wood way to go just make sure you check the moisture content and let the wood acclimate to the environment of your shop for at least 4 - 6 weeks and keep it at around 8 - 10% moisture content, I even let it sit for a few days to a week if I have to take a lot off on the planer. Oh and finish the bottom as well and put a few leafs in to keep the working parts smaller?