Very nice - I built one a few years ago but had no real opportunity to run it properly so decided to move it on. At one point whilst building it and considering that I might keep it I was contemplating replacing the burner as it seemed rather weedy affair. Clarry Edwards in 7mm scale had a really neat meths burner design that was more like a toast rack than a couple of pots. He had a J70 tram engine which if I remember correctly with a firebox 3/4" square, with his toast rack burner it would happily run all day long and not be short of steam.