The locomotive needs a "petticoat" in the smokebox. This part is an extension of the smokestack and held direct the exhaust up the stack. Starting with some round rod, machine the end to match the inside diameter of the smokebox.

Attachment 196320

Then lathe work to bore plus taper the lower edge.

Attachment 196322

Not seen are two tapped holes in the upper side for which screws attach both the pettitcoat and the stack base to the smokebox.

The saddle is the piece that supports the smokebox, and with it the front of the boiler. On many locomotives this is a casting to which the cylinders mount, but here it's a separate assembly. The first task is to fabricate the top, which is the piece that attaches to the smokebox directly.

Attachment 196324

Attachment 196326

Attachment 196328

Attachment 196330

Next. machine two pieces that form the front and back of the saddle.

Attachment 196332

Attachment 196334

Test fit with the smokebox and boiler:

Attachment 196336

To fabricate the rounded sides, I started with a length of DOM tube.

Attachment 196338

Attachment 196340

Attachment 196342

The assembly was then welded.