I started by making strips of wood and gluing them up into TWO sheets. I went with two so that I did not have to do a large pocket and remove so much material. on one sheet you will cut all the way through all profiles. on the second sheet I opted to do a shallow pocket but this project will go faster if you only do an outside profile for the second one and then this becomes the bottom.
do your best to Glue the two parts together to align the profile. potential to add alignment dowels in the future, or oversize the outside profile of one and come back with a flush cut router bit.