I've shot in Turkey a lot.
One of my best friends is one Ali Murat Erkorkmaz, a well-known animator out of Kadikoy in Istanbul.
The Storm 6 is available in parts, suitable for import into Turkey. That's why I suggested it. You can have the people at Helipal build it, test everything, then take it apart again and ship it to you, OK for Turkish Customs, but most importantly minimum hassle on your part, and less liability if something doesn't work properly.
Trust me, I know what I'm talking about!
Also you again insist on a quad drone, which, as you know, will fall out of the sky if one motor/propellor goes bad.
You have zero system redundancy plus you're in Ankara, so spare parts will be a long time coming to you.
Redundancy means if one part of a system breaks down, you can still complete your shoot and come back with the imagery, land safely, and get paid.
Yes, by all means fly a quad - if you have a couple of quads available at a job. One goes down, you fly your backup. That's redundancy the DJI way. But you're not doing it the DJI way, are you? How many quads do you have listed? One. No redundancy. No backup on a job. It doesn't work, you go "oops" and be glad they don't charge you for the loss of their time, setting the shot up. Which could be maybe, what, $15,000? $30,000 for the crew, stunt men, actors? Maybe no production costs, but still you went out there to make a photo or a film and you came back with no drone and no shot. And you have only one drone, and it's gone now and now you're in the middle of Izmir or Bodrum with no backup.
Ask me how I know.
If you buy separate parts from different suppliers, there is ZERO way you can tell if they are going to work together unless you get them and put them together. Different people have built various drone designs, and in general they will work. However, those people usually have collections of bolts, screws, different ESCs, FC etc radio gear left over from other projects, and even then nobody will tell you if you build something this way, then it will work first time. No such animal.
You need to look at a big international supplier such as HobbyKing or Helipal and have them put together everything for you, including all screws etc., and then if something doesn't go together then let THEM work it out before they send the drone to you. That includes all of the ESC calibration, radio programming etc., which we haven't even started to touch on. There is a HECK of a lot more to this than you are mentioning, that you don't know about.
If you want to learn, sure, do it yourself.
If you want to fly and shoot, then read, listen and follow one who has gone before.
Or, else fine, don't listen, and find out for yourself.