Replacement enclosure for a Quark PMM

[NottheDan]

I recently got a Quark 330A PMM (with a Lead-Acid battery in the back) that unfortunately came with the outer casing smashed to bits. Does anybody know where one can get a replacement case? Or do I need to junk another old instrument for its housing? Seems like quite a few British manufacturers used this style during the 70s/80s.