I once shared a taxi with a senior RAF officer who had been involved in the flyoff between the Firecracker, Tucano and PC-9. He was underwhelmed by the Firecracker and wanted the PC-9 but got the Tucano as a sop to the South Americans post Falklands. As others have said they were virtually hand-made and interchangeability of parts was problematical, some being up to 25mm longer than others (allegedly).