Sub similar to TS1700 would not only give edge but would be quantum leap for Turkish Navy. Complete new page. Nationalization rate or tonnage doesn't have to be that high. TS1700 provides very good balance in underwater to land attack capabilities. Biggest advantage is national design. It would be ours unlike German export subs. Foreign intelligence would have to do work to gain info on the platforms. It will give us the surprise element.
Problem is you can not arm the subs more then 8 missiles or torpedo. Does it matter if the sub is bigger and more noise? should skip this and go for 3000+ ton subs...