[el_nombra]

it will show up as black without any colour on as when making a scope in edit mode white is black in game..unless u put a filter over the top e.g noiseb and noiseg files into pak then the lines will show as white without colour..
so it would be along the lines of
folder -----> textures = zoomoverlay.tga
..................................kartop.tga
..................................karbottom.tga
...................optional = noiseb.tga
..................................noiseg.tga

folder..........scripts....= hud.shader