Apartment for parents: 210 m² single-family house and 80 m² apartment

I have here 5 plans from friends who are architects, I don't necessarily find the plans impressive.

What is this information useful for now?

To be very very honest and probably sound mean: I don't believe you can rate anything as good, bad, or impressively good or bad.
Your constructions consistently have nothing to do with debatable designs. There is nothing habitable.
I would be ashamed to put something like this up for discussion here.

Harsh words from me, but said again and again. Only you have never listened to me or anyone else here.
You are incorrigible and do not want to admit that you are in no way capable of designing a house.

Wake up and come back with an architectural design worth discussing

I have here 5 plans from friends who are architects, I don't necessarily find the plans impressive.

You are under a misjudgment: based on a floor plan, YOU are not able to assess the quality of a design. This thread shows that.

That is not bad (and not meant badly), you just have to know/admit it. Your faulty self-assessment will certainly lead you to a debacle.

Also: "not impressive" is still significantly better than what has come from you so far.

Regarding the 4-week deadline: please move heaven and earth so that no floor plan has to be finalized yet (at least none that must be adhered to).

And then please start listening to the people here. You won't get more honest feedback anywhere else, not from friends and family and certainly not from draftsmen who are only there to implement specifications.

Eleven and a half months ago, you were at the point where an architect would have left nothing standing from your sketched ideas (could not have). Now you are at the point where what you present will already considerably resemble what the architect makes of it (meaning: you can see that it has the same origin).

But that still does not mean that your plan could replace that of a trained planner.

In four weeks, financing (review) is almost certainly not yet secured. Based on these drawings, I do not see you being able to present calculations relevant for approval and KfW funding.

Let’s assume for a moment that you have found the unscrupulous provider who is already willing to build according to these "plans." Then, standing in the shell construction, you will not be able to believe that this is the house you "planned." But even then, a professional planner can no longer help.

It would be a shame if you had to pay for the realization that your talents do not lie in architecture with a ruined plot as tuition.

Even the most brilliant essay gets a bad overall grade if it says "off topic." As a trainer for packaging engineers, you certainly outclass everyone else, but the walls of your house are better left to someone else to tinker with – apart from the fact that a house in which one likes to live needs more than that.

Yes, and the bank is clearly calculating with prices that are too high.

And did your draftsman or BU ever pin a price to your last plan? Or approve it as being buildable/feasible like that?

Would the space for the gas heating be sufficient like that?

If the heater is placed on the base slab and then built around, that could work.

But normally there are also things like gas connection, water connection in the utility room, etc....

I wish you all the best on your further way