Man, you guys suck.
People have been converting nice road frames to fixed gear for on road training for years, what's seriously the harm in how he built this bike? He can just put gears on it later if he wants. It's just a nice frame, the cable stops and horizontal drop outs will make no difference as he's rolling along on the road.
Investment wise, he now has a great frame to ride fixed, that he can also change to a road bike in the future if he likes. If he had purchased a fixed specific frame, he would not have had that ability.