I just finished reading your site. You have some original ideas, like these creatures that have been haunting the dreams of past generations, which now must be confronted by the new settlers. I don't think any such "Ahad Radius" could ever exist, 11500 AUs is way beyond the heliopause that seperates the Sun's realm from the interstellar medium. I'd read up on the science of the outer solar system. Also, I find it hard to believe that nearly all of humanity is dying out from diseases that we seem to have a grip on in 2005. I like the Ark design, but find a way for the ship to scoop up energy from space as it goes, so it doesn't slow down at all. Alpha Cen may have such planets, we may not notice the wobble of the stars yet, as it is a binary system. Just keep in mind, Proxima Cen is almost as dim as a brown dwarf, it would be invisible from either of the Alpha Cen systems. Okay, pretty neat. I would reccomend reading up on the sciences though, but keep at it.