Wow, I clearly don't know how to stage the pics with explanatory text between each one. Anyway, the first pic is laying out the choices of wood followed by a selection based on the wood speaking to me. The ice cream sticks illustrate the intended orientation for the front and ends. The 4th pic is the chosen piece cut to 18.5 inches at the table saw.
Next I cut the piece almost in half making 3-4 cuts. Then, its off to the bandsaw for the final separation. I have found this easier to do than trying to cut entirely with the bandsaw because sometimes the blade wanders and I then have 2 pieces of uneven thickness. A couple of trips through the planer gives 2 pieces just over 3/8" thick. An initial sanding with 100 grit to further clarify the conversation. A streak across the jointer to get a smooth straight edge, followed buy a rip cut at the TS for parallism. Set up the stop block on the miter gage to make identical 12" and 6 inch cuts. This prevents me from making errors that later lead to squaring problems. I now have 2 long sides and 2 ends and discovered I made the mistake of cutting the short ends from the wrong ends. Oh, well. Another thread talked about such things, yes?
Stay tuned. Next will be rabbets for the sides and bottom, followed by dry fit and glue-ups. Listening to the wood speak continues throughout the process. That will tell me about the trim, possibly an inlay, and the finish. After that, the lid runs approximately the same course, and finally the inner tray.
Hope you enjoy!