I can't wait to see this custom 'GabeCube' bootup video on a big TV hooked up to a Steam Machine

The way to get a custom load screen locked in on the Steam Deck is to ensure your video is a webm file in 1200 x 1800 ...
TweakTown

Steam Machine spotted with smart custom E-ink front cover displaying CPU and GPU temps

Valve has been showing off how custom front covers can be used with the Steam Machine, including a nifty E-ink display ...