Early 1920's Underbust Corset Pattern

I played around for a while with a tight fitting princess seam slopper and considered the possibilities for a early 1920’s corset and then I stumbled on this lovely corset pattern in a French 1920 "La Mode Illustree" magazine and it was exactly my measurements!

What are the chances?

I used Google Translate to read the text related to the pattern in the magazine and it gives very little instructions as to assembling the corset, other than to cut out the pieces, mark them and sew them together!

It does talk about the benefits and cost of different types of boning but does not name a preference. The article discusses spiral steel, feather boning and whale bone, verifying that all those materials were still in use, at least in France, in the 1920’s.
 
I drafted the pattern according to the one in the magazine, marked it, double checked the sizing, tweaked it a little, added seam allowences and this is what I came up with:

In addition to these pieces I will need to cut casings for the boning channels.