For correctness's sake, Temple of Apademak is the Kushites normal Temple. You can check the specific and generic names of the Temple in Alpha 23.
Never mind, It's the same name in the latest alpha. I'm just trying to be smartass here and failing.
Walling in 0ad is costly in both resources and the mental capacity required to make sure they are actually sealed. palisades and stone walls need to become easier to seal and place if they are to become more impactful on gameplay. I've had moments before where palisades were remarkably successful in protecting my base from large amounts of cav in p2, but its quite rare to see palisades actually accomplish what the player envisions when they are built.
May I suggest using Photopea? It has a Normal map generator out of the box.
You can also easily alter the channels of the normal maps after they're made.