Thanks Pobbrett, for the response.
I failed to mention I already have the stress toy and am looking for something a bit more realistic. I've been looking into sculpting, but want to avoid molding and casting unless absolutely necessary.
I actually have some money to fund this little guy, something I didn't have before I decided upon my costume! That reminds me: Looch, girls dig the hair I have, so I don't think I'll ever go back to the 9th Doctor's buzzcut! (Or did you mean David Tennant's?) I think you misunderstand, however. The Nth Doctor would be the last incarnation, nth meaning highest. Actually, I guess I'll show you a crappy pic of what my costume looks like thus far:
