We've had this portable air conditioner for a number of years, and for years I've been trying half baked ideas for overcoming some of the challenges it presents. One such challenge is to mount the ducts to vent air outside. The idea has been to replace the screen in the window with something that holds the vents securely but lets the light in. Last year I just put up a sheet of plexiglass and held it in place with silicone. It was ugly. So I'm building window mount from wood with a plexiglass window (recycled from last year's project).
Once again Adobe Ideas on the iPad serves as a great application for drawing up plans.
Got the materials at Menards and wound up buying a bundle of 50 pieces of lath and a 4'x4' sheet of 1/4" birch ply.