As the holder of the TC, you become the "Manufacturer" of the Product and if you have access to the original drawings, or the ability to essentially replicate the PMA process, you can make all the parts you want. Of course, you may be able to qualify the original OEM parts for the same application by identicality.
I'm interested in the configuration and differences in the Rotor and Drivetrain System with a different NR and Main Rotor diameter? Does anyone have a link to good data on this?