I think the problem
@SgtGungHo is raised is good for the program future. Turkey should not make the same mistake it make in Altay program. Engine is very crucial. Just think if you have made successful prototype and then GE or US government refuse to supply other TFX planes with F 110 engines after the program reach mass production phase.
There should be a commitment in the form of contract from GE to supply TFX program in mass production phase and this should have USA government approval as well.
The preliminary design and detail design is based on specific engine, you cannot change the engine what ever you like. Not only the dimension but also the weight of engine is critical on the design phase.
Some of you must raise this question to SSB and TAI official to clear this issue. There may be some Turkish journalist in here or some of your friends maybe senior journalists in Turkey respected news outlet. Or at least ask the issue on TAI twitter account.