Hi,
You really are setting a really high standard and it is great to see how to do it, I must get round to my conversion and this is a good incentive.
The tear shaped object on the drivers side of the smokebox is the atomiser for the lubricators, you cannot see the superheaters on the outside of the loco.
As for a good book on the basics i would suggest either "How steam locomotives really work" by Semmens and Goldfinch or "Raising Steam, the design operation and driving of steam locomotives" by D Griffiths.
If on the other hand you want a more detailed text then either "handbook for steam locmotive enginemen" published by the British Transport commission or for even more technical book then "locomotive Management, Cleaning Driving Maintenance the last version of which was published in about 1955 (that i know to)
Hope this helps
Kind regards
Duncan