Your asking the window to do the job of a lantern or cupola.
The home my parents built in 1980. Two solutions employed, the dormer and the window that projects through the eave line [don't know the name, it was popular locally 150 years ago].
Other solutions exist.
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Methods:
- I'd create two or more forms (plywood or whatever) and cast shallow hexagonal pyramids.
- Transport them to the site and asemble into compund curve 1/5th hemispheres.
- Erect a mast at gound zero, array the five panels around it so their adjacent corners can be bound.
- All five are winched upward until they interlock and are suspended above the ground; ground anchors are attached with clevises to align and apply tension.
- The mast gets a spiral stair, the pentagon opening gets a[n f-in] yurt, and the five triangular openings at ground level get a deck that hinges upward into a storm shutter.
From 2015:
