Quote Originally Posted by KennyMark View Post
...I intend to either permit them to be used simultaneously by family and friends...
If you're planning on multiple, simultaneous users, you'll need a way to separate the printing stations. Plywood dividers, between the enlargers, extending out 18-24 inches (if printing up to 20x24 inches) will allow users to pull out paper without any exposure from another enlarger. You may want to look for pictures of community/college darkrooms to get an idea for design plans.