I guess that your cube is (as the one at instructables) can only light one LED per column/layer combination, resulting in a maximum number of 25 simultaneously lit LEDs, is that correct?
That is so fascinating!!! This is exactly what I wanted to do. I'm currently a freshman in college learning all this as a computer engineering major. So, I don't really have the knowledge of the circuitry and programming, but I am getting there. I really want to make several 5x5x5 LED cubes for my friends as a christmas present! I'm just searching for the best instructions to work off of. I think this is perfect. I don't really have a XML reader for the link that you shared with the components list and PCB. Any suggestions? Also, would you mind if I asked a bunch of questions in the next few weeks about the construction of the cube? I sort of want to know what I will be doing before I do it. Thank you!