I was considering going the same route. Flightmurse do you have an update on the brace?
I'm not flightmurse but recently bought a CVA pistol and the brace adapter from Farrow Tech. Paired it with the SBA3 brace and love it.
As for the adapter, it very obvious that it's 3D printed. It's a hard plastic (ABS?) with fairly prominent printing lines. I didn't care for the feel so much, so sanded it down and sprayed on a rubberized coating. Now it looks and feels much better. Other than that, it does exactly what it's designed to do and I would buy it again. If you go this route, be very careful screwing in the buffer tube. I found it difficult to start the tube into the adapter without cross threading. If you're not paying attention and applying some force, it probably would be easy to mess up the threads.