Easy instruction for transparent console:
Open notepad and copy that:
console
{
nopicmip
nomipmaps
{
map textures/tremor/purple.jpg
blendFunc add
tcMod scroll 2 2
}
}
Save as XXX.shader (e.g. super-transparent-console.shader, warning it can have only letters, letters, _ and -, don't use spaces!)
Make folder "scripts".
Put shader to folder.
Put folder into "zz_transparent-console.pk3".
Run Tremulous.
WARNING: Not tested, i wrote it now!