Her Mbuna type tank on Youtube.
I was interested when I saw this video on youtube... yeah it looks good. But all those cave rocks were glued together (she said) before putting them all in the tank. So, I guess the rocks can't fall or get rearranged. And I'm thinking it is possible to lift the whole structure out once a year or so and cleaned and put back in. But I would want it smaller or maybe in two pieces (to make removal easier).
Still, it looks like a fine idea to arrange the whole structure outside the tank until satisfied, take a picture, then break it down and put it back together permanently with silicone sealant (which is apparently what she did).