'PX48: 002 comprises the boiler and cab as a one piece 'print'. To complete the major items of the body kit you will also need PX48 001 (smokebox and running plate) and PX48 003 (tender). The model is designed to be powered by a Graham Farish 8F chassis for the loco, and liliput bogies for the tender.
For further details, and a builders guide, please see my website www.glr3dmodeldesign.co.uk
Many thanks for looking, if you've any questions, please ask.