Any updates? I too am using Worbla; let me rephrase that, I've bought some Worbla and in the process of figuring out how to make it all work. I've started with the Vambraces. I figured they would be easier to start with. I'm curious to see what the inside of your Cuirass looks like; from the pics it looked really thick and a bit heavy.
As for the cloth parts, well after pouring over all of these forum posts, I'm some what conflicted. Some are going with a Silk, you mention a black twill, and there was some other fabric that escapes me at the moment that others liked. Any chance your friend that is helping you out with this part knows of a McCall or Simplicity Patter that works best?
This is the first outfit that I will have ever made so this is a huge learning curve for me. All of these posts and pics really help out a lot.
GL