N Gauge Stirling Single Ivatt Tender Motorised V2

This N Gauge GNR Ivatt tender is designed to accompany the Stirling Single (separately available), recreating the engine as it was in commercial operation and current preservation.  The model is slightly stretched, so while not precisely to scale (unlike the V1 variant available) it has the advantage of being fully motorised.  If used with the generic 4 and 6-wheel coaches available these can make a complete vintage train.  

Also available is the early-preservation Sturrock tender and a scale (unpowered) Ivatt tender variant.  

Necessary to Complete:
Kato 11-109 54mm Motorised Chassis Ex 11-103 (requires modification – see video below)
Couplings (ELC couplings can be used, but the method used is at the builder's discretion)
(If further weight is necessary there is space under the tender body)

Optional additional details to scratchbuild (at the builder's discretion):
Brake handle
Crew
Coal