I made this by following instructions from PeterP_DIY.
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Step 1: Template
Make a template using cardboard or if your feeling confident draw straight onto check paper. I used one of my son's old maths book.
Step 2: Use Exterior Wood
Cut your exterior wood to size and paint with exterior paint. Leave to dry for at least 1 day.
Step 3: Test Run
I did a test run on scrap wood to make sure the holes were not too close together. It actually took me 3 tests to get it right.
Step 4: Time to Drill
Place the check paper on top of the wood and drill your holes through the paper.
Step 5: Final Step
Remove the paper and drill the screws into the ready made holes. I finished off by using a screw driver as suggested by PeterP_DIY who I got this wonderful idea from. When you use the screw driver instead of the drill you can get them nice and level.
Step 6: Enjoy
Hang in your desired position outside and impress your neighbours.