"let perfect not be an enemy of good enough" has some merit here. BTW the issue of building 1500hp diesel engine suitable for MBT's is IMO more because of unwillingness to invest $$ than that of tech. Or do you really think that the Brits, French and Italians are incapable of building a similar powerpack with the same reliability as the Germans?
No, but as you mentioned: Someone has to do it! But can Turkey do it alone for a MBT engine, the same for several helicopter engines, turbofan engines and so on!
IMO you have too many projects running at the same time with too similar schedules and even if you don't like to hear it, not much experience so that this lack of can be overcome only by a few $$$ within a few years.
Therefore again, talk is cheap ... and until I do not see an operational Turkish MBT, trainer, fighter, ship, helicopter and so on running on its own power, reliable for years, I won't hold my breath.