Step 1: The design
As I mentioned before, the generator needs to be protected from the rain. It should be able to breathe. The cover should be beefy enough to stay on the generator. If I was a sheet metal guy like the Tuttles from The American Chopper, I would have done every thing in sheet metal with a cool paint job. Unfortunately my skills are limited to some crude carpentry, so I decided to make a plywood housing with louvered vents for air circulation. I did think of generator getting hot and found the hottest part to be the exhaust muffler. I decide to put a aluminum sheet as a shield against the heat.