Not a super thorough answer but if you’re thinking about a full bathroom vs a half, one thing that may come up is the current size of your water heater and the size of your family. 3 showers running simultaneously and/or water appliances may warrant getting a larger size heater which will add to the price of the project.
It’s gonna be a full bathroom, though it will be tight quarters. The water heater is something I hadn’t thought of though. So thanks for bringing that up.