Nice work Brandon. I would however, add another shelf on the right hand side to balance it out. And since you used such nice wood I would apply several layers of clear coat to show off and protect the wood.
Most likely to late to fix the warp but if you want to replace them or end up needing to there is a simple way to keep it from happening again. Screw on some 1" X 1" across the grain. One on each end placed about 2" in from the end of the board and recessed enough to keep the stiffener from interfering with the operation of the lid.