Some others have already said something about the construction costs and surely many more comments will follow.
We just have to take into account that it will be super difficult to find a suitable plot of land in a timely manner.
However, I would like to emphasize the point I quoted once again: Do not underestimate the search for land. I don't know the local situation where you are, but I can only report that we have been searching intensively for 3 years and only something is starting to take shape on the horizon. If I keep your area in mind, it certainly won't be any easier for you. In short: It's nice to think about building a house (I have been doing that for years...), but if the right plot of land simply isn’t available, then all of that remains just theory for now.