High End Enclosures

For DIY audio including chip amps, amp clones etc. can anyone please comment on high end enclosures and/or the fabrication of faceplates?

Critics of high end audio sometimes suggest most of our money goes into enclosures - where for companies like Pass or Rowland who make unusually beautiful things, that may well be a significant percentage of the retail price tag?

Are the OEM manufacturers of high end enclosures known or are they trade secrets guarded by their clients?

In todays high tech, 3D printer world, can any appropriately skilled and tooled metal fabricator make a beautiful enclosure? Or would the initial set up be too expensive to make single pieces?

Further to who might make enclosures, I have also just noticed that the faceplate, finish, handles and power switch on the Vincent Audio SP 331 pretty much look identical to those on mid 1990's Levinson amps?

It would be fun to design and build things for personal use if I could find a fabricator who could do this without breaking the bank?

Thanks for any thoughts or recommendations,