I do believe that it will work. I showed the plan to my wife and she said to find space for the wardrobe and then it fits. 120cm hallway is certainly not too little. The utility room is no further from the living room than if it were in the hallway. The kitchen is even closer to the living room than if it were accessible from the hallway. I don't understand why one should measure from the front door? The living room is the central place in the house, if I want to optimize routes, then from the living room to room X (kitchen, utility room).