Well done! Even the metal on the tops looks good, and you folded the corners so they wont be cutting your fingers every time you take the top off.
I feel your pain.. I have built a few houses, and hated the finish work so usually paid someone else to do it. Quickest and easiest joints are rabbit joints for the corners, but if you have glued and nailed the corner butt joints well they will work fine. I still have several boxes in use after many years of service with those joints.