I thought I would post a couple of photos of my current boiler project. This is for a 1.5" scale / 7.5"gauge 4-4-0 to the Walt Disney "Lily Belle" design which is being built by a fellow here in the USA. The overall length is 24.75", barrel length 15", and barrel diameter is 6.125". One particular challenge the design presented was that it required a 5/8" parallel forward offset in the foundation ring of the rear heads which made the forming and eventual fitting more difficult. It turned out not to be quite as difficult as I thought it would be, although it did take just as much time, and it all came out well enough.