I find it difficult to believe that this is the only Christian KidSafe Certified 13+ website on the internet. However, I will agree that it is probably the best one due to the sheer quality of the game - and even the quality of the community it has stirred up.
I have thought of building one myself (probably about Lego) since I do have the expertise to do that (and yes, it would be KC13+, no compromises - after what I saw happen without it...). I wouldn't hold your breath, since it would be at least a year down the road, and getting enough money to run it might be a problem. (among other relevant business and marketing concerns yawn)
So yeah, it probably wouldn't be as good as the Aetherlight.