The best PC case ever made was obviously the deskside Onyx.  There are no exact dimensions for it.  Space was a lot cheaper in 1995.  Lions still imagine someday having enough space. 

1 hit showed 24" L, 20" W, 26.5" H

It's certainly plausible.  Sadly, what the internet eventually showed matched none of what young lion remembered of it.  The original memory of it was a wider puck with rounder corners & a distinct grey upper band.   It's possible young lion saw a prototype, but realistically, the memory of it was just poor.

The memory of the monitor was accurate.  It was a strangely primitive, curved shadowmask for the futurism of the puck.