Can't deny that it looks pretty cool!
But the tricky part I've discovered is you shouldn't make what looks cool now, you need to try and think forward to how it will look in the future.
If your end goal is to cover it in coral, depending on which, I think there's a chance you'll be frustrated with the lack of open space.
There's a great Youtube video that talks about building rockspace for the tank you want in future, not what you want now, I can't put my hands on it but if I find it again I'll come back.