A: The opening is 1/8"
A: Use acetone or finger nail polish remover. Be sure to use gloves and eye protection and use the cleaner sparingly and quickly remove.
A: Yes, , we used a Dremmel with a cut off wheel. A hand saw would probably work but a power tool would give a better finished edge.
A: Yes with a utility knife, or a good pair of scissors.
A: Yes it can be cut.
A: Yes-we had no problems & it looks great!