Take a look at the pic I attached.
The top piece represents a 24"x60" sheet of red vinyl. Note the .5"x55" red rectangle that has been cut out across the top.
The middle piece represents a 24"x60" sheet of black vinyl. Note the .5"x55" black rectangle that has been cut out across the top.
These show how they will look after you weed them out.
1 - apply transfer tape to the sheet with the black vinyl.
2 - tape the red vinyl sheet to your worktable. Do not apply transfer tape to this piece.
3 - place black vinyl sheet on top of red sheet, aligning it so that the black rectangle is exactly on top of the red rectangle.
4 - attach a masking tape hinge to one of the long sides of the black vinyl sheet.
5 - flip black sheet over on hinge, remove transfer tape and apply to the red vinyl sheet.
The bottom piece in my pic is how it will appear when finished.