Antlercrafterz in Arizona. I've send grip frames to him as well, (especially non standard RWGripframes) and he fits Elk Antler or anything else nicely to them, at a very reasonable price.
Here's the last two (pair of .45's) sets of Elk Antler grips I had made from Nathan at Antler crafters. I pulled the ( both R W Gripframes) grip frames and shipped then to him, along with my favored thickness at screw and at base. They were fitted perfectly, and right at the thickness I prefer. Quick turn around too. [email protected]. I know he does any materials for grip panels, but I love the antler look.
Texas Grips has made 6 sets for my 1911s and S&Ws. Some are purely made to my design specs. Here's a couple of pictures. These are made from Mesquite. Henry is very easy to work with and prices his products reasonably.