N Gauge Stirling Single Loco Scratch Aid

This is an N Gauge model of the iconic GNR Stirling Single, now preserved in the National Railway Museum.  There are three alternate tenders (each separately available) to complete the model, comprising:

Ivatt tender V1 (unpowered – for use with the motorised generic 4-wheel coach)
Ivatt tender V2 (motorised – for a powered locomotive)
Sturrock tender (also unpowered, to represent the engine in early preservation)

Consequently the engine can be produced to represent two different periods in its career and give the option of scale size (with motor coach) or full motorisation.  Together these parts produce a fully operational model, which with the generic 4 and 6-wheel coaches available can make a complete vintage train.  

Necessary to Complete:
Graham Farish Royal Scot bogie (large wheel version)
Farish A3 tender wheels (x1)
Alan Gibson P4 (finescale) scale 14.6mm Caly Pug driving wheels (Ref 4844E)
Alan Gibson crank pins
Styrene strip (0.5mm x 1mm) – for additional wheel spokes
Nickel steel strip (0.5mm x 1mm) – for slide bars (15mm length; advice on fitting can be found in the video below)
Pin (for bogie mount)
Wire (for various details including tender coupling)
Weight (the boiler is hollow)
(NB small strips of brass will hold the wheels in place)  

Optional additional details to scratchbuild (at the builder's discretion):
Lampirons
Injector valve rodding
Sander rodding
Reverser lever (its base is pre-printed)
Smokebox dart
Regulator
Crew