Thanks for the nice comments.
It may not be obvious from the photo, but there is no bottom in this frame (the outer box). The frame is a U shape with BB Ply glued on as a top, with the frame bottom left open. The drawer is an oval with the center removed, and BB Ply on the bottom. The taper cut between the drawer and frame is what keeps the drawer from falling out the bottom of the frame - like a dovetail fit.
I will put together a pattern - this one was cut on the fly.