Good article, but there are some possible problems that aren't addressed.
1. The cupola should be properly grounded with a Class I or Class II lightning protection cable, extending from a U.L. approved air terminal to a properly installed ground rod. Check local codes.
2. The 3" screws that are shown anchoring the cupola are insufficient for the wind loads on this size cupola. Use through bolts.
3. When you open a hole in the roof, blow in rain can enter too through louver blades.
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How to Build a Cupola: Step-by-Step Pictures and Instructions
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