The next step is routing the rabbet for the back panel and then creating the back panel.
I used the Domino with 5mm cutter set to a depth of 13.5mm to create the rabbet (timber is 16mm deep).
You can control the length of cut by using the markers on the fence, so there is no ned for stops and you take the tool to the work, not vice versa. You can also limit the depth of cut by using a plastic collar on the Domino pistons which is set to the depth of cut you want. In this case, 5mm.
The back panel was to be Alpine Ash, but the white board I picked up and started cutting was, in fact, Birds-eye Maple. Such is life! The panel now consists of four book matched pieces. In retrospect, I'm not terribly upset as the Maple will give good character to the inside of the cabinet.