We added some storage cabinets above Exsisting closets for a customer. Great idea if your needing more storage. We had to cut holes above the closets, and custom build cabinets to fit in the spaces.
We updated the door hinges to hidden euro style 35mm soft close and the drawer slides to full extension soft close slides, also changed the knobs and pulls.
We installed 15 custom fit pullouts to existing cabinets at one of our clients homes. We had to modify 3 openings that had a center stile, we took it out to make the opening wider so the pullout could go all the across. Then we put it on the back of one of the doors so when it's closed it looks like it's still part of the cabinet.