For large letters you can look at a home center to see if they have house numbers and lettering in the size you need.
Another thought is to use a pantograph to enlarge what you have now.
For your material sandwich the finished piece inbetween other pieces or use tape to cover the piece.
Another thought is to use a pantograph to enlarge what you have now.
For your material sandwich the finished piece inbetween other pieces or use tape to cover the piece.