I'm going to be focusing on carcass with my breeding too, those aren't "my" line yet.
Yes! But it’s an excellent example of what to expect when starting out... the CX came from careful selection and hybridization. Even if @pkarkos knows what to expect from a DP breed, there will need to be some info on it available to the CSA clients. If you are getting a Meat CSA box that just lists “beef, pork, chicken” and the general consumer opens it up and finds a skinny (comparatively to a “normal” CX) looking carcass, they might get a little dismayed.
You may need to include some info about preserving and restoring a heritage meat breed, or truly free ranging or pasture raising poultry. And the differences to expect in flavor, texture, and volume of meat from a bird that has lived a more natural life. A turkey farm that provided birds for the grocery store I worked at was able to very successfully market smaller, leaner, heritage turkeys with a little pamphlet and some basic info to our meat staff, in a high end Grocery Chain in one of the most affluent neighborhoods.