I have to be honest. I fully support this and hope it happens. But we have to be reasonable. Turkey doesn't have much experience in aerospace. The ATAK is helping a lot, but it's a tilt rotor, and wasn't designed by us. The basic frame I mean.F-35 was designed to met the Requirement of USAF, USN & USMC to replace their cold War Era Fighter, there must be several Compromises made ! Also the Development of the Engines needet some financial Ressources. TF-X is far different, it's the requirement for an Air Superiority Fighter for TurAF !
To develop a full fledges stealth fighter without experience is a very tall order. Sure, with outside help a lot is possible. But I doubt the time frame and budget mentioned. The idea is good though, tens of billions can be spend inside TR, and perhaps one day even exported. That's what 1st world countries are made of.