Over the years, I've built quite a few things in my darkroom. I call them my particle board masterpieces . . .
>> A stand for my 4' "The Sink". Includes shelf space for trays, etc., and a neat drying rack.
>> An enlarger stand that, in addition to anchoring the enlarger at it's base, has 2x6's that extend up the sides to anchor the top of the enlarger. The easel table top sits on a 1' extension that can be removed for greater magnification.
>> A custom sized film drying cabinet. I couldn't find one the right size, so I built my own out of poplar. (None the less a masterpiece, but not a particle board masterpiece.)
>> A sheet of about 3'x5' plywood that contains all my plumbing and electrical equipment. It connects by a power cable and hot and cold water and rests on two vertical 2x2's that have been fastened to the wall. When we sell this house, I'll easily be able to take it and re-install it at another location.
>> A water bath tray for my developer tray.