Is the financing so realistic? What is the amount of the financing?

I think it is also hard to say whether you can manage the financing if you don't yet know how much you want to finance. I would first start looking for a plot of land and think about the house and its features so that you can create a rough cost plan. At the same time, you could already go to your house bank and have them calculate how much credit you can manage; after that, many things will become clearer.

Yes, definitely.. We have seen the part of the world that we wanted to see. Now it's time to get down to business ;-)

We just lived very well, took 2-3 vacations a year. ;-)

...and with the purchase of the land and the house construction, we will immediately restrict ourselves. That is usually the first mistake, because the creature of habit “human” often fails at this. So first save a little more and accumulate equity. If that succeeds visibly, then it can start.