The problem usually is that when you provide a "template," the planner or architect doesn't put much thought into it and just copies it. The result is usually neither original nor practical and often even very impractical. It is usually more sensible to go to the architect with formulated wishes and requirements. Their job and profession is to translate your wishes into a sensible, functional floor plan.
Take any of the mentioned values plus a small buffer as a guideline for your budget calculation. At this stage, it is purely an estimate. The floor plan does not matter here; your stage is too early to do this based on more concrete measurements/numbers, etc.
P.S.: I also believe that the floor plan doesn’t work like this. And especially one of the most fundamental things, the staircase, does not work. Fundamental because if you adjust it to functional dimensions, you will have to redo the floor plan... that throws everything into chaos.