You need to employ some Yankee ingenuity. That process could go much more quickly if partially automated.
http://woodworker.com/images/j210/105-380.jpg
However, if you want to have something that will always be needed, I would bet on windows. The higher tech windows may need to be manufactured in a factory, but the trim is best done on site.
A lot of scribing involved!!
You need to employ some Yankee ingenuity. That process could go much more quickly if partially automated.