Here is a video that may not really fit on this Forum, and probably should be on the Locomotive Board if anywhere, though this isn't large scale nor live steam.
I do have a somewhat significant collection of HO & HOn3 model hand crafted brass locomotives, mostly from back in the 1960's thru 1980's that were built much in this same fashion, and I consider them to be true works of art!
The one shown being built is actually O-Gauge, but other than being twice as big as my engines, thus carrying a bit more detail, the process is much the same.
This to me approaches astonishing for the prices that these little gems were actually imported from Japan (later Korea too) and marketed at back in the day!!!
Enjoy:
https://youtu.be/o93J-ebHGhs?si=s6pk1weaHcfNzthD