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Really cool project.But did you hear the noise of the plane at around 1:46:10 on the full video clip? Think that pilot may not have been so keen on it. I wonder how far they were away from the plane.
In the UK and Ireland if you ask for a 2x4 they will know exactly what you want. Smaller builders yards will have more knowledgeable (older) staff!In mainland Europe you just need to work out what you require in mm/cm. 2x4 in metric is 38mm x 89mm like wbrohpy1 has said below but ultimately look for something with the same ratio of 2:1 in a size that suits you.
In the UK and Ireland if you ask for a 2x4 they will know exactly what you want. Support a local builders yard and they can help you out. In mainland Europe they also supply wood in the same ratio of 4x2 or but the measurement is 48mmx24mm.
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