@yoonyin many roads lead to Rome...what u describe is what i aim to achieve too with my current renovation. Basically u need to conceal your piping and use a conceal type of mixer (for hot/cold) water supply. To share briefly -

1. You will need a source that supply hot water - solar heater, heater tank storage using electricity or heater tank storage using gas

2. Lay and conceal relevant piping (hacking, putting pipe and re plaster the wall)

3. Use conceal type mixer + rain shower system.

Do note you might need a boaster pump if water pressure is not enough. This si just my own experience, u will need to talk to a contractor to get an estimate of price and time needed