A few more photos, I took some of things you should never see once a loco is in service. I was prompted to take the photo through the regulator bush after having a look in there and noticing lots of light was making its way in. While looking in there I was able to see the blower tube is okay after we had to push the backhead bush in due to (I assume) the smokebox tubeplate end falling back during soldering, and I also saw a huge gap in the solder seam between the backhead and outer wrapper. You can't see that in the photo.
I also decided I'd do the sealing up on the cylinders soon so took off a cover to have a look in there and clean up for a gasket. I took a couple of photos in there for people to see how close the piston comes to the ends of the bore.
The blast pipe and blower ring.
Inside the smokebox. From left to right the snifter valve, blast pipe, and the short fitting that connects the superheater output to the steam chest inlet manifold.
Piston at the front and then the back.
Inside the boiler. You can see the blower tube top left, the crown of the firebox and the tubes.