Lots of ways to address this. Bending wood you need to make a form and a steam bending box. Long process but works great. You can also cut it on a band saw depending on your equipment. You can make a jig and create the inside on a table saw carefully. Then trim the outside and sand the to a finished dimension. But JT probable stated the easiest way cutting staves and gluing together. I've done this in all the processes described but it comes to the wood of choice and the properties of that that wood.