Make your cuts based on the plans and drill pocket holes to make assembling a breeze.
Using 2x2s and 2x6s create the planter box by assembling with exterior wood screws.
Build the base to the planter box with 4x4s and 2x4s connected with pocket hole screws.
Assemble the planter box and base together using 2-1/2 inch exterior screws and wood glue.
Fit the pond liner into the planter box after the sealant has dried.
Cut perforated drain pipe to fill the base of the planter box, then cover the ends with landscape fabric and tape.
Place a PVC pipe into the perforated pipe at a 22.5 degree angle. The fit needs to be tight.
To keep the water levels consistent add a 3/4 inch hose for overflow drainage to the side of the planter.
Add your chosen mixture of soil. I use a 2:1 ratio of vermculite and peat moss underneath regular potting mix.