Hi Ed,
How large is the room where your darkroom is located. The one I am building is to be shared by 3 people. And of course the expense is also. My room is 13'-6" square. I will have 2 eight foot sinks and 3 work spaces. There is a small room on the other side of the darkroom wall that will be a finishing room and office. It is about 13'-6" x about 9'. There is a 32" door connecting both rooms. Like you, the 3 of us all have most of the equipment needed to use the darkroom as soon as it is finished.