Fireproof, Weatherproof, Building Materials For A Covered Porch?

[southern california guy]

I want to put a Caribbean style covered porch, with an outdoor kitchen, on the back of my house behind my dining room.  But I want to use fireproof weatherproof materials -- like aluminum, fiber cement, and metal roofing.

 

Does anybody have any recommendations for the structural beams?  Do I use something like "alumawood"?  Or aluminum that I cover with fiber cement? Does anybody every do that??  I want something that will be relatively safe from fire.  I understand that many fires enter the house from the soffit and I wouldn't want the cover to be place for a fire to start.

 

My backyard is relatively small with a very steep hill that I plan to cover with colorful tropicals and palm trees, maybe with a waterfall and a little pond in the corner.  So I would want to use something that would not mildew, and could be washed off with a hose.  I am residing my house with fiber cement

 

.