The mod itself shouldn't be too hard, the model is simple and you can tear the script from the TF2 Spy items.
Also, signing your posts makes people want to kill you.
Heh-heh, sorry about the signing thing, I won't do that anymore.
Nice suggestions about how to make it, and I probably should have made this clear earlier, I have no experience at all with scripting or making add-ons.
Just to let everyone know. :-)