Our front porch is a door with a glass panels in wooden frames either side. One
of the panels is rotten, I plan to replace the whole thing (sometime!) but for
now I want to cut out the large rotten panel and just replace with new wood.
Would appreciate suggestions as to what material I best use to fill the
inevitable gaps there will be at the joins. There used to be a thing called
"Plastic wood" - probably there is something much better now?