Anor Londo is nice indeed. But man, he should go for Ringed City with the phantom archer at the beginning. Nobody would ever be able to invade.
Throw in a couple of Ringed Knight in it for even more overkill. And actually who stops you to even ADD ANOR LONDO ARCHER ON TOP ? Or even better, the bullshit pontiff doggo.
Man this would be so evil I wouldn't even be able to stop myself from doing it.
IMO this arc is the moment things really gets fun. I need moar novel chapter.