No one mentions that to wire in any 240 volt lights etc you must have an electrical cert, its a legal thing and if you do have a fire or any probs it's a good excuse for your insurance company to deny your claim i.e no payout, not to mention 240 volts can kill.
Surprises me to see parents letting 13yr olds play with 240 volts, bit like playing soccer on the motorway.
Robert Smith has the right idea using 12 volts, much safer and legal.
I prefer the brought products as its near on impossible to get the same quality finish (unless that sort of thing is your trade of course), and the safety asspect certainly comes into it, most off the shelf products have been tested and approved and personally my life is worth way more than saving a few bucks.
But making your own is basically a kiwi way of life so if you do, take it to an electrician to check the wiring and give you a cert for it, then there will be no legal or insurance probs.