You seem to have taken liberty with my intentions. My intentions were that the eastern and western borders of the area were under your control. However, the idea of having barriers put up in place is amusing and worthy.
That being said, your layout was waaaaaaay too elaborate, Agon. If you had a few days, Agon could shape that much astral space together. Assume you have about 150' of "astral wall" to work with. Try using shapes on the Google Draw to map it out. I gave you an example "kill zone" that you can work with. I'm assuming, though, that you may want gaps or the like.
A "secret door" is definitely feasible--you would have time to build something like that, but it would cost you wall space, maybe 20' worth of wall for every one, given the time you'd need to shape it.
Map:
https://docs.google.com/drawin...8Lk/edit?usp=sharing