You realize a custom like this is going to cost some coin, right?
I have one that I bought on this forum. Unconverted OM, serial number is from 1968, .357 frame, .41 Magnum. I bought it here, also bought some .41 Special brass from the same guy, picked it up at my FFL, took it out to my pasture, fired six shots, been in the safe ever since. Only Ruger I have fitted with real elephant ivory stocks. I have no real intention of selling it but looking at my Excel serial number list... I have a lot of money tied up in the gun and I literally never fire it. So I'm willing to hear an offer and think about it. PM me if you want to discuss it. I've never even taken any photos of it... I really should do that.