Swampman,
Central WI you say? Contact Mark Beasland at Mark's Born Again Birdguns near Wausau.
http://www.mbabllc.com/page/page/7927803.htm
Heck of a nice guy and a double gun afficianado. If you ever get over to the Twin Cities I would be more than happy to help. I have done it every way possible - professional fitting, custom made stocks, making my own pattern stock and even making my own stocks. I built my own try-gun that fits on a Beretta o/u. A lot depends on how much you are willing to spend. If you do a bunch yourself it could be less than $100 depending on what you need to change. You could also spend $500 on a fitting and $5000 on a custom stock. If you like shotgunning a custom stock is the ultimate pleasure.
Regards,
Jeff

"We are men of action. Lies do not become us."
Wesley