Tips they don't tell you about:
Make the room as big as you can and add more electricity than you think you need. Also, you can never have enough sink. I will have 16 feet of sink. I may have more but I just don't know yet. They are not in place yet. Where I live you need to add cold water to the tap so you can cool the tap down. In the summer, the average temp straight from the tap is about 90 degrees Fahrenheit. So, we are installing a chiller. The water heater is only going to have to be used about 3 or 4 months a year.
Also, the construction time will take twice as long as you think it will.