This model is a variation of the Harefield Alien and uses pre-printed paper.
Click here for a single A4 sheet or click here for 4 xA4 and 2xA3. *These will print on A3 paper.
After printing out your paper cut it out on the thin lines indicated and follow the Harefield Alien steps 4 - 20 and then come back hert.
The last few steps are just a repeat of the Harefield Alien steps 35-39.
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And here he is assisting me in diagramming the folding process.