Sorry, I think I'm somewhat less than clear. My post, for what it was worth, was lamenting that I've ran out of space in my cabinet and and busy stacking boards and components - into the third dimension. Intended a little tongue-in-cheek.

One quick suggestion - having stared at some real-estate in my cabinet where a PSU burnt itself out - a lesson learnt to not seal enclosures without cooling - if you've not already planned this, make sure that you have a cooling fan or two in the cabinet for extracting hot air.