This is a Mannin Models 3d printed kit of a Ruston & Hornsby class 44 3d. It comes with sperate roof, cab internals a chassis mount to fit a Spud drive unit and a removable engine hood so you can get at the Spud drive fixing. If you want to use this small loco for your O9 model I can produce an adaptor for a Kato chassis.
 
It is an unpainted resin kit, the painted pictures are to show you what it looks like when built.
 
The Mannin Models range is produced by Didcot Design and Prototyping Ltd.
 
Instructions can be found under the instructions page on the website.