Put in twice as many outlets as you think you need, you will find you use them all eventually. I put in 3 quad boxes in mine and wish I had more. I put wire shelving up near the ceiling for storage as well as several doored cabinets over the workspace. I also now have a panel of brown perfboard behind my enlarger thanks to an ingenius Apugger who shared his layout. I left it brown to soak up any stray enlarger leaks. A wall full of perfboard hooks is nice, all the carriers hang up as well as anything else hangable, including a small lamp and timer for highlight flashing.