I cut the wire out of the screen inserts to some Andersen windows last year,
then added shrink film over both sides of the insert frame, then added cheap
storm windows, with another layer of shrink film over the storm frame inside
the glass, so these windows have 2 layers of glass, then 3 shrink films, then
another layer of glass. They've held up well, with glass protecting plastic,
and the optical quality is good.

Nick