I’m not sure what this piece would actually be called but Kitchen Sideboard sounded good to me. The client wanted space between the boards for a more vintage look and really the only way to accomplish that look while holding true to good woodworking is through a process called shiplapping the boards. You might know it as “tongue and groove”.
This way of joining the boards allows for seasonal movement and still attains the vintage look the client wanted. The shelves are 3/4 inch oak plywood with a 1/8 inch thick pine veneer to cover the nasty plywood end grain. The pegs you see in the second picture are not only aesthetically pleasing, they are functional as well. Every rail is connected to a leg using mortise and tennon joints–a rectangle peg in the rail squeezes into a rectangle hole in the leg. All the of tennons and mortises were cut and gouged out by hand using a saw and a chisel. The pegs are added as a safety measure as over time, lots of time, the glue which holds the peg in the hole may fail. The pegs are there to reassure the joint will not fail.
As for the stain, the client wanted a weathered look and the only way I have seen that look accomplished well on new wood is with a mixture of steel wool and distilled vinegar. It has 5 coats and turned out much better than expected.