@simon the viking, be very, very careful here. One thing leads to another, and 20 years later you end up with an attic full of old airframes, more in-commission models than you can maintain and fly, and plans for this winter's build already in hand (Grumman Cougar twin). It's addictive.....
If you want to encourage the lad and see where it goes, try these:
https://bmfa.org/Info/Education/Education-Kits. Very highly rated and very cost effective. Can't go wrong. My dad encouraged me a bit, and although I gave up when I grew a bit older, I came back to it 20 years ago when I had a bit more time and got in radio control and engined models. Now I fly this....
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9 channel, 30cc petrol engine. 10ft wingspan. Beauty! Took me a year to get from kit to flying.