I might have been one of the first people to recognize the possibility of using a LACK table as an equipment rack. I built a DVD player into one in like 2003, recognizing that a whole stack of 19" pro audio gear could be bolted in there.

Built one in 2001, there were lots of discussions about it on I think it was the Audiogon forums at the time, a whole thread of a good few hundred people building them. I seem to recall a few had been using them since the 90s as well.

Folks were doing this in the late 90s on AVSForum..