As far as I understand the extension of offer depends on the interest of potential clients. The point is that he is doing the laser cutting, has no time to draw the props. If one provides him with the vector file of the prop profile, he will cut it. What is currently available is the result of mine and one more friend's orders for which we made the drawings. If you contact the owner and send him the profile he will cut it.
The decals and prop bosses are not included, just the veneer cutting. You may wish to see my recent post in the Gotha G. 1 thread where I showed the Reschke prop elements for the model.