So, and now to "my" Celebration 125, freely after Clayderman "Celebration pour Schnuckline":
Take a basement from V1 and an attic from V2 (without carport and balcony), it then looks like this:

In the left part, modify the wall layout kitchen / dining according to your wishes. However, mirror your changed staircase (so that the exit fits the standard floor plan V2 attic), this probably also affects the course of the wall in the attic due to the width of the stairwell where the bed of "Child 2" is located in your bedroom.
Then change the ground floor in the quadrant top right plan as follows:

The left picture shows the original floor plan. Transfer the room "Heating" 1:1 into the basement. On the ground floor, relocate the front door and the WC. The WC can be made larger, for example with a urinal where the washbasin is drawn; the washbasin then moves under the window.
The supply and drainage shafts are only extended by one floor height and remain untouched in the floor plan!
Your little junk room for the vacuum cleaner (the children will loooove to “hide” there ;-) fits in as well. And a small shoe cabinet next to the front door, a half-high one with little trays for the keys on top.
(Where there are white areas in the floor plan, I have just quickly erased what is different in the original there, otherwise I would have kept you waiting longer).
THIS can be changed within the proportions of this basic design. You can do it differently in terms of taste, but in terms of scope, this is the limit of what is possible with a basic type of Eighty-eight squared regarding change requests.
To be able to change literally every little detail on the basic type, the house would have to be about as much larger as your contribution from Jupiter (uh, Marc from Mars) is longer than One sixty-seven ;-)
A house that is only ninety-five percent ideal, but still with both kidneys, is something after all ;-)