Yes lots acroos the board, from sound engineer type forums (like gearslutz.com) to diy forums to audiophile forums. Then there are all the mega expensive commercial products and the €10k Grimm Audio speakers originally used ucd modules (maybe they still do? sure I've read ncore mentioned in their description now).

I'm keeping my eyes peeled for modules for sale on the diy forums.. I've noticed some oem versions of the ucd400 boards on ebay slightly over-priced but I'm a little uncertain as to the difference, whether they require further building of input circuitry etc?

Would kind of like to make my own linear PSU but not too clued up on anything but the very basics (transformer -> bridge -> caps). Cases would probably end up being some old throw-away thing from ebay where there are plenty of broken studio amps or industrial equipment with sturdy cases ready made.