This would have been the biggest 3D domino pyramid on YouTube and very probably in the world (not a Guinness record though, they don’t have such a category yet), with a bottom layer of 27×27 dominoes and 13,482 pieces in total, but there seems to be some kind of Egyptian curse on domino pyramids.
Just for the few haters: I have a life… and you’re not exactly the right person to judge that just from having seen this video without ever even having met me.