I spent a lot of time placing mine so it is locked together. Except for one piece, an over hang, that I didn't feel comfortable with so I epoxied it in place. I hand picked my rock and most are very larger pieces knowing exactly how I was aquascaping my tank. Although all my tanks are done this way, Any tower I have had have been 1 piece of LR.
Even though I have nothing for most of it I am definitely not hoping for the best, but it really comes down to the rock you have and what you are trying to accomplish.