Small Caterham for my kid

Hi,
I´m thinking about bulding a small Caterham (cca 1:2 scale) for my kid.
The first version should be less powerful (50-100ccm) and simple as possible. So i got a kids quad as a "donor car" on my mind.
Take the front and rear suspension, engine, electrics etc. and build a frame from wood first to get everything in the right position.
Have someone built something like this? Can you give me some advice, pictures etc please?

Thanks a lot

Push the boat out and do something like this . . .

http://imgur.com/a/EdTWR?gallery

http://jalopnik.com/5978728/engineer-dad-builds-hi...

I've been looking around as I'm thinking of doing something similar. There are loads of sites offering the gear you need in term sof motor, electric or otherwise. I've seem some plans as well, these are all pretty basic.

There seem a lot of challenges for this in term sof what to scale down and what to sacrifice. 2 seater, becomes 1 seater etc . .

Have you seen the BWE Grasshopper, don't know if they're still available.

here: http://www.locust.org.uk/about/brochures/bwe/grass...