Lack of modelling mojo not withstanding I have managed to progress this a little in between life getting in the way.

First, I modified all the etched hangers in the kit to accept the brake 3D printed shoes

Then having stripped all the previously built brake gear down into components parts as needed, I started to fit the new shoes/hangers to the tender first. I quickly discovered that I will need to re-drill/position the brake hangers for the shoes to fit snugly to the wheel treads.