I did mine by hand (no pictures yet).
I printed out a large Block letter "G4" on white paper, set it on top of, and taped it to a sheet of adhesive backed vinyl, and cut out my letters. It took me about 10 minutes each side (super anal about it) to cut them out. I then had to take the plastic off the sides of my G3, and remove the old G3 Graphics, then I placed my new set on the sides 🙂