Chimera for aquascaping have you considered making your own base rock? From my small experience with diy rock, it would be perfect for tayloring an aquascape.
I was thinking it would be good for building a base structure, perhaps raised off the ground so that detrius could be blown out. Then just stick real live rock over it.
I had another idea that I would like to try on my reef tank (the one thats many years away) , I loved the look of crackers cube. I was thinking of having the bottom of the tank below the viewing area, maybe by 50cm, perhaps more. This would allow a BB, and you wouldnt have to worry about plumbing/pumps ect being seen(so you can blow the crud away) , and I think rock dissappearing into the bottom would look real cool. Kinda like a spire coming out of the gloom. Perhaps the walls below the line could be painted or something, whilst incorporated into the stand.
(Forgive my crappy drawing ) I dont know how practical it would be though. Oh, and go easy on me 8)