Floor plan of a bungalow with 140 sqm - does the storage space fit?

I am uploading our plan with furniture. That might explain it better. We definitely want to keep the bed in the middle. We just like that better than against a wall. The shower on the wall doesn't bother either of us in principle, we both know that from the USA, and we find a bit of water sound soothing, or should there be other reasons?

But that is much worse in most bedrooms ... I find a door right next to the headboard much worse ;)

True, often the door is on the opposite wall to the headboard, but directly opposite the foot end? Usually it's closer to the next wall and not so centered.
Right next to the head is also bad, I agree.
According to Feng Shui, the best is not to sleep in a passageway, so not where the energy flows ("high traffic areas", near door, window...).
Of course, this cannot be perfectly implemented with every floor plan, but if you are building and can influence it, I would do it.

What I also noticed:
Because the large bathroom is only accessible from the bedroom, it will not later be possible to swap rooms. For example, if a child needs a bigger room for some reason, or a child moves out and you want to use that room differently and sleep in one of the smaller rooms yourself, and so on. Personal needs change over time. That deprives you of flexibility. You can do it, but I wanted to point that out.

311 cm shell dimension ... with 200 cm mattress width plus bed frame there are just 50 cm left on the right and left sides of the bed.

We have 180 cm mattress width, so there is a little more space left. We wanted to have space for wardrobes, the bed itself is just for sleeping and getting in and out we can already manage that way.

I think the objection about swapping rooms is good. On the other hand, I can also imagine giving a child the room if necessary and using the other bathroom myself. I believe we are not that rigid about it, but good point!

Here is my proposal. With the changed layout, the bedroom is a bit larger.

Right under our bed, the pipe to our radiator was already running along.

Hehe, also a form of water vein ;-)