deck extension

I currently have a deck that is 18m long by 2 m. It is out from the 1st floor and I am planning on widening the middle of it (5 m) by 2 m. My quandary is what timber to use. The house floor timber is rose gum and I have a solid Tasmanian black wood kitchen. I now have wooden vertical posts but will replace it with s/s horizontal wire to create the spacious feel. The maintenance is an issue for me as I am away a great deal for lengthy periods.
Any thoughts out there?
Thanks


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