I have seen in forums that some spend about 10K extra, sometimes more, depending on the requirements.
No, not depending on the requirements, rather on the construction specification, what it offers. You are relatively modest. You can see from the photos that there are differences from the design planning. If you already expect something from the photos, it can get expensive. A shower cabin as well as the kitchen also have to be paid for. Nothing can be assessed here. In addition, there is the monthly WEG fee. There certainly isn’t a satellite dish either, so you have to pay for TV monthly. You have already calculated the floor coverings...