A few hours into the guitar cabinet, the sides are assembled and pretty much ready to finish. Here are a couple of views: on the left you can see an inside view of the sides, complete with aromatic cedar lining (it's gonna smell goooooood!).
The front side of the side (if you know what I'm saying) is on the outside of each piece in this photo, so if you rotated the outer edge 90 degrees toward you and the sides faced each other, you'd be looking at the front of the cabinet. The cutouts are for oak 2x4s that will hold the doors and strengthen the shelf and the top.
Oh, and the ugly grey stuff is foam mat, which is easier on the feet than a concrete shop floor. Used as illustrated it doesn't do as much for one's feet, but has the virtue of protecting the outer ply of precious oak veneer, which looks good, but is only slightly thicker than, say, cling-wrap.
The second picture shows the outside of the sides; you can just make out the reinforcement/front edge strip of oak along the inside edges (which are the front edges once assembled, blah blah blah).
Next up: the bottom, the shelf, the top, the legend.