To rap up this point, what I am needing is help adding textures and making the sprite sheet for the walls. I attempted this on my own and read many tutorials but with my non-existent Blender knowledge, I could not get it to work properly. Any help would be much appreciated and if you want to make any changes to the models or restart entirely that is welcomed! A great bonus would be to include a wall column, like the 4th image, with a turret mounted on top; this is not required.
I can provide Blender files on request.