We won't gain anything from designing and building our own jet?! Are you high? What we'll gain is our own jet and, more importantly, the scientific, industrial and engineering capability to design jets. You don't seem to be able to get it through your thick skull that Turkey has been building...
Please provide a link to an official source showing what the offset % is for Turkey, and stop insulting people who question you. Apparently you learned nothing from your recent ban.