I dont think he’s talking about Z fighting. So u have created an abstactional grid, but didnt keep in mind the size of blocks themselfs. U can offset the blocks by the half of their size to match up perfectly
Removing textures wouldn’t work that well as it would prevent things like different colored walls.
I don’t know enough about CSG to say if that would work and I’m also not sure what you mean by step one wall back?
If you look at that screenshot I sent, you can have two walls positioned like that. I colored the walls so you could see the difference between the two.