Brakes

Brake ring
The cast iron brake shoes are usually sold as a ring then turned up to the diameter of the wheel as seen in the photo, the same profile should be followed as the wheel (taper or flat depending on what has been turned) Holding the ring flat to the table and drilling the hinge pin holes with a no.21 drill as per drawing so the hinge pins will be parallel to the wheels

Brake hangers
The hangers are cut as blanks roughly to size and the three holes drilled into them then the fine detailing can be done either by file or milling as in this case The brake hangers after final machining these are made to the drawings and have been sculpted on the sides

Brake Cylinder arrangement
The full size locomotive has the steam brake cylinder offset to the right hand side of the locomotive, not in the middle as shown on the plans. It's also on the opposite side of the cross rod that connects it to the brake hangers. This has probably been done to simplify the brake cylinder because on the full size locomotive the action is to pull up the brake arm. This requires a gland on the piston rod. Since most of this detail is hidden, it's entirely up to the builder as to how far he goes in making this closer to the real thing.

The plans don't make any provision for a hand brake, but this could be fitted in the same place as the full size locomotive.