I start by cutting the side and back rails to final dimensions. Then proceed to cut the tenons. After that, each tenon is custom fit to each mortise. The tables are glued up, and the drawer rails and supports are installed. The SketchUp model can be downloaded here: http://sketchup.google.com/3dwarehouse/details?mid=82236bf856dff003b8fe77caf901462
I use a Leigh dovetail jig to cut half blind dovetails in the drawer sides, and assemble the drawers. Then its time to fit each drawer to its opening with a hand plane. Then a simple glue up for the top.