Speaker shelf, top panel and bottom panel installed. Top panel and speaker shelf are secured with dowels, if I made another one I would dowel the monitor bezel in at this stage too. The bottom panel is secured with screws going up from the bottom into 20x20mm framing timber either screwed or dowelled to the side panels (just make sure if you use screws that they're not too long.) You can't see it but the top back panel is also dowelled in at this stage, there's not much room between the top panel and speaker shelf so I cut the speaker holes installed the speakers and mounted the grilles for protection.
