James takes model aeroplanes to a new level when he tries to make a full-size Spitfire out of Airfix. The venture soon hits problems when it becomes clear the giant 36-foot pieces may not be strong enough, and nobody knows how they will fit together. James hopes he can enthuse a group of reluctant teenagers to help him pull it off - but he soon realises he has another big battle on his hands convincing them it is a hobby to be proud of.