I caught a 12 lb x 33" walleye at Lake Newell a couple of years ago and had a replica mount made by Advance Taxidermy out of Caledon, ON. They do great work, but it is somewhat pricy (~$700 for my plain wall mount). I just sent them the length and girth, plus fa ew pictures. I received the mount in about 8-9 months via FedEx (in a big giant box)
Here is their website:
http://www.advancedtaxidermy.com/
KJPFISH