Iirc a good few years ago, someone managed to get some flight cases made. Not cheap but compared to new boxes, possibly not so bad value, especially considering the value of the contents.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).