This is possibly the biggest 7 segment display ever (i haven't seen a bigger one) and i made it using my Pixel MkII design (here).The display is now pre programmed with numbers 1-9. I have included a programming helper in the screenshots if you want to program it yourself. I have yet to think of any advantages of a display this big, other than it looks cooler to have something this big rather than a small display. Its best viewed at night because it uses redstone torches. Feel free to download and use.