In this first video it was just 7x7x2 in size:
In this next video it is up to 7x7x4 in size and still growing as more LED's arrive:
I will have to use a pad per hole soldered breadboard to proceed any further. The 7x7x4 setup takes over 200 jumpers to connect everything. I would buy a printed circuit board but as far as I know no one makes one that meets my standards! The closest design I have found uses latches and lots of transistors and resistors. My design uses nothing but 74HC595 shift registers and a ULN2803.
Here are the red, green, blue and white test pictures.
And now the schematic for one layer...