Frisket Used in Painting "Christmas (Somewhere in Time)"

This is the frisket film used in painting Christmas (Somewhere In Time).  I know it probably seems difficult to use this in an artwork since there are so many numerous pieces. However, while using the film I keep it in it's correct location on the backing sheet (Like keeping the pieces in a jigsaw puzzle in position.) It is then fairly simple to locate the various pieces as needed. Remember also that a majority of the pieces are always on the support (illustration board) as the painting progresses.