Get a Bunnings team member to cut a piece of dressed pine board to 45cm length. With a ruler measure 10cm from the end of the rectangle piece on the right side and mark it. Then do the same on the left side. Then measure in 1cm from the long edge on both sides at the 10cm mark and make another mark. Measure up from this mark 20cm and measure in another 1 cm and draw square line that runs parallel to the long edge of the rectangle. Do this on the other side.
Now take a dinner plate and place it bottom up on the timber and align it so each edge of the plate intersects the two lines you have drawn on either side of the timber. Then trace around the dinner plate from one line to the other side to form a horse shoe shape. Now on the right-hand side at the start of your drawn line, measure in 4cm from the edge of the timber and make a mark. Then about 21cm up from this mark measure in another 4cm from the edge and draw a line down from this mark to the first mark so that you now have a line running parallel to your first line on the right-hand side of the timber.
Next measure up 9cm from the bottom of the board and then 1cm in and make a mark. This mark will be 1cm down from the start of your outside right hand line. Then measure up 2.5cm from the bottom of the right-hand side. From this point measure across 2cm and make a mark. Do this on the left side. Then on the right edge measure up 1cm from there measure in 8.5cm and make a mark. Do this on the left side as well. On the right-side measure 4.5cm from the bottom of the timber and make a mark. Do this on the other side. From this mark measure 9cm across and make another mark. Repeat this on the other side as well.