Don't befooled by the generic 'art and craft' look of the home page:
**LINK**
Poke around a bit and find meccano-a-like, pop-pop boats (even spare hulls and engines), some really imaginative wooden/electric kits for kids (with a fair amount of finishing required for some).
A German company and the prices are generally remarkably good, with things that would make excellent presents for creative teenagers from less than £10 with build times suggested of up to around 10 hours.
I rather liked a wooden LED-eyed walking dinosaur robot for less than £20 – this was a pre-cut ply kit, ideal for younger teenagers wanting to make something that 'goes'.
They supply metal sheet and a few useful bits as well.
Neil