Dave,
Just been using a 3 colour version, but it gets a lot more expensive the more colours you have, to have 8 colours, costs eight times as much as a single colour.
But joking aside, if you can scribble up a little sketch like this, making the part becomes an easy exercise. For one off's there is no need for full cad packages, and they are usually a lot easier to understand because you can just stick bits of info on them wherever you want.
John