i have one for my portal gun and one with sounds (custom glados fight song and deez nuts whenever i walk on metal and more)

most custom sounds/textures are fine, the only ones that aren't allowed are wall/floor textures and textures with lineups on them

is the cabinet not allowed to change textures ?

the elevator i mean (my english is bad sorry)

it depends, you should join the discord and share an image of the textures youre unsure about

cant you say it here ? i just want to mod the panel on top that says aperture and the light bars's color