Okay, Uatu.
First off, that is a very nice tree wall.
I think you used C, D, L, and M exactly as was intended.
Earlier, when you said high walls, I thought you meant tall walls as I had forgotten that Dinonykos had referred to this extended walls as high walls on the templates. The move from extended walls to hyper walls is fairly painless.
They are the most similar of any two formats.
Regarding wall J, and I hope Dinonykos will correct me if I'm wrong, it is often left blank on overlays and doors, so that at max distance only one overlay/door appears instead of three.