Cut the long apron pieces to size and drill 1 1/2" pocket holes at both ends. Center the aprons on two legs and attach them to the legs with 2 1/2" pocket hole screws and wood glue. Build two leg assemblies.
After cutting the short apron pieces to size, drill 1 1/2" pocket holes at both ends. Center them on the leg assemblies and attach them to the legs with 2 1/2" pocket hole screws and wood glue.
First, cut the runner support pieces to size and drill 1 1/2" pocket holes at both ends. Attach them to the bottom of the legs with 2 1/2" pocket hole screws and wood glue. The pocket holes should face down, away from the table top.
Cut the runner to size and attach it to the center of the runner supports with 2 1/2" wood screws and wood glue, from the bottom of the runner support, into the runner.
Once the runner is in place, measure and cut the short trim pieces to size. Attach them to the top of the runner support with 2 1/2" wood screws, from the bottom of the runner support, into the short trim pieces.