Ohio State Plate
You can glue different license plates together with various types of epoxy.
Plate Assembly
Once they are glued together you can use a over head projector to mark your lines
Project Outline
This overhead projector will give you the lines you need.
Filling in the Holes
once your initial line is drawn make adjustments accordingly.
Cutting the Outline
Once you've marked your lines you can use metal nibblers, hack saw, and tin snips to cut out along the line
Final Product
And this is your final project!