Will have more of a think but here is a picture of the intended place to be bedecked (with a rectangular platform that runs along the building for further than it sticks out).
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The idea is
- to make the area useable by creating a flat surface on a pretty steep downward slope (is steeper than it looks in the picture).
- If it were flat it could be sat on and enjoyed because it has a good view and proper privacy (but the area is west facing and sits in the shade of the house all day until evening, when you do get good sunsets.
- There has been talk of a pizza oven being constructed on top of this deck, with firebricks.
But the shadiness does not bode well for the wood.
I'm honestly not as excited about it as the would-be deck builder is but do trust he'd do a good job, being very particular.
If not decking, we'd probably be looking at building a giant wall at the bottom of the hill and then infilling it by moving great piles of rocks and earth to create the flatness? Which seems.. unlikely.