Luv2safari;
I really enjoy my 412S, as a double shotgun it shoots really well. I love it on the trap range. I don't know if I would go to the trouble to have a stock bent and recheckered. But if I came across a lefty stock I'd grab it in a minute. I have the 9.3x74R barrels for it and enjoy shooting it a lot. If you ever come across one keep me in mind.
"Powhatan 42" is a a friend of mine. He has an awesome collection of the Valmet series. I believe most of the rifle barrels as well as the 12 and 20 gauge shotguns. A few different stock designs. A real treat for the Valmet enthusiast.