We used the router in a hand held position to cut the remaining dado's. Fit a 2" x 24" x 3/4" stop block in the dado. Measure the distance from the edge of the base plate to the edge of the bit, then cut a space board to width so the total adds up to 12". This will give a 12" spacing between each dado.
Rest the board against the stop block and clamp it to the upright.
Remember the bit is now moving in a clockwise direction, meaning it will pull the plate to the left as you cut.
After the dado's are cut, rip the upright and shelves 12" wide on the table saw. We glued and nailed the back on and then used a 1/4" round over bit with a hand held router to edge the shelves.