I haven't done much research on the 6.8 (due to time), but from what I have read it definately has potential. Or perhaps the 6.5 Grendel is a better choice. I just don't have the time to invest in it.
Mel- I think if you can off a 6.8 AR platfrom, or even a SPS system. I believe you will be offering a product nobody else does. If the ballistics are supperior to the .223 or superior, and you can market it at and affordable price (ie- what you have done w/ the SC series), then I think you have something there.
If I have time later, I will email you what I would do for the rifle, down to the smallest part. Or maybe I will post it, but again, its just an idea, do with it what you will. I know your swamped right now.