Virgin Valley who does a lot of barrels for Encores and Contender's also makes custom stocks for XP-100's. At least they had someone about 8 months ago who did. You explain what you want and they will build it. "Virgin Valley Jeff" posts a lot on the www.accuratereloading.com
under the single shot pistol forum. Since I don't have any TC products, I don't have their contact info anymore. But close to a year I spoke with their stock maker and it sounds like you can get exactly what you want--but it won't be cheap. I will keep in touch when I finally get things up and running with the 6.5-284.
If you like shooting at long Range there is going to be a Long Range Handgun Clinic (Shooting out to a 1,000 yards) put on by Don Bower. Date will likley be July 7-10 (Mon-Thurs). Cost will be $200 you are responsible for food and lodging. Don will also supply handguns and ammo. Of course you can bring and shoot your own. I went last year and had a great time.