This planter takes approximately 90 minutes to make: The design is simple, and so is the required level of woodworking skill, the only tools required are a square, pencil, electric/cordless drill and suitable spade end drill bit, and a tenon saw; although a chisel and some sand paper would be useful for tidying up the slip joints.
This is a great spring project that can transform the look of your garden. I love this.
I cut down some 2.4 metre long pallet deck planks that were 9 cm wide and 1.9 cm thick to 1.9 mtrs long for the base tier so that the tier inside the slip joints is a 1.8 mtr X 1.8 mtr square.
Note that that the 1/2 depth slot is 5 cm from the end of the plank, and the 1/3 depth slot for the second tier is 20 cm in from the inside edge the first slot:
It is important to remember that on all the slip joints you are working inwards so that you keep the dimensions and the slots in the correct place.