You actually don't need separate binds for T and CT. You can include everything in one bind, both M4A1 and AK47 as well as a defuser.
Then if you are T, you cannot buy M4A1 and defuser anyway.

Maximum alpha value is 255, 800 is the same as 255.

Useful script.

You cannot mix colors like that in Source, altough it would be nice.

cl_crosshaircolor 0 => Green
cl_crosshaircolor 1 => Red
cl_crosshaircolor 2 => Blue
cl_crosshaircolor 3 => Yellow
cl_crosshaircolor 4 => Light blue

Any value different than that just gives you the default, which is green color.

Alpha commands are the same in Source, to get the most visible cross, you would have to use these 2 commands:
cl_crosshairusealpha 1
cl_crosshairalpha 255

So, what to do with assessment, you can move this tutorial in CS1.6 section, or you can correct it so it would fit in CSS section.
As for now, wrong section.

This is really helpful.