From the Harris plans but smaller; 60% of the book's drawings. I redrew the design in Alibre Atom3D to accommodate the smaller size and required changes.
The boiler is based on the PM Research 3" vertical kit with features moved around to suit, extra holes and bits. The cylinders are 0.6" bore cast iron based on Elmer's designs for small slide valve engines.
Unfortunately there are a couple of "oddly shaped" teeth on the winch drum gears (they were cut as a pair) which is causing the noise from the front drum (oddly). I think the gear centres may be slightly different allowing the rear drum to run quietly but the front one not so much.
In the end it's been a rather long, challenging and satisfying project (but for the gear noise and paintwork). Now on to the next project whatever that might be.
Photo before paint with the "water tender" and a video running.
Charlie