This is the basic step you have to follow
Fold sheet in half
This is optional. I did 4 creases so I could cover the back n bottom of final product. Also, the creases help to show where to stop cutting.
Quick n simple sketch to be used
These are the lines I was referring to that you'll be cutting. See they stop at the crease. This is how you want to leave ur design. You will cut all the outlines.
Added a little xtra design to my pattern
Here I cut out my 1st letter. Same technique for all letters.
This is how it looks with light in back
Top pic was my 1st try. 2nd pic another sample