Something like this may work. Note the changed door positions so that anyone in the bedrooms can visit the bathroom without disturbing anyone else in the lounge !

standard bathtubs take up space, look outdated and in today's busy life, rarely do we get time to use them. Better go for a high end steam shower with a bench seating if its within your budget. However, a free bathtub in a large bathroom however can be staggering. From my experience and the skill set available in our country better not attempt self made, it is quite demanding.

ceramic if you have the budget

Hi MJ, As per your requirements, you should hire an interior designer. This need to be planned properly. Please let me know where are you located? You can refer the image below to get an idea. Regards Prity