The left side of the builtin consists of a desk with a small set of drawers below and shelves above. Here’s a side panel from the drawer cabinet, showing the dados for the bottom, top, and back panels:
Dry assembly, showing the groove for the face frame. The face frame is just a 3/4″x3/4″ length of poplar with a tongue to fit in the groove on each panel.
Final assembly of the drawer cabinet:
The drawer cabinet will contain a file drawer at the bottom with two shorter drawers above. Here’s the panels for the file drawer. These were made from edge glued 1×6 maple, planed to 5/8″. Lacking a dedicated jointer, I jointed the edges on my router table, which worked well enough that the seams are almost invisible:
The two shorter drawers, during dry assembly:
The box joint jig:
The short drawers after assembly and sanding: