PMA Parts in a large percentage of helicopter items are/were based on "identicality" and sometimes may be licensed by the OEM and there is a plethora of info out in the wild about it.
In the beginning a lot of the tech data required for "identicality" was based on where the equivalent item was used in a military version and all the data was available under FOI.
i.e. The US military owns the designs of it's aircraft and puts out for tender the manufacture of replacement parts and supplies the info required to make the item.
PMA Parts and EASA is a bit of a minefield as they only allow parts that are "not a critical component", licensed by the OEM or EASA approved STC or design change.
Makes for a lot of fun when you import an aircraft into EASA land.
Back to the thread - a clean sheet small certified turboshaft will be interesting to watch. Never say never?