This article couldn't have come at a better time for me.
I borrow a friends son now and then (its like having my own kid but I get to give him back at the end of the day!) and I had been looking around for a cheap but slightly more challenging project.
This looks just about perfect!
The only part I am a little afraid of is the silver soldering of the boiler. Even I haven't done silver soldering before let alone instructing a kid!