I am unclear on this. The roof is a pergola, so rain, etc. will still fall on you, but it will have walls, so that you cannot get much breeze. Is this correct? Not criticizing, just trying to understand.

For a focal wall, I would probably go for a vertical garden wall.

You have stated that one wall will be plexi glass & one will be wooden slats. Will the one that is wooden slats have spaces between the slats for air movement?

How about doing two walls with the wooden slats and having deep planting boxes at the floor level with espalier trees planted in them. Having a fountain within this plan will also be nice to have. Also a firepit that has no roofing above it.

The espalier trees can be pear, apple, kiwi (depending on the climate you live in).

I would space them further than that for good air movement.

What a wonderful extension to your living space this will be.

I'm not sure of the purpose of the plexiglass. It won't give any privacy, and it won't give any air. I'd consider slats on both walls, maybe a vertical wall where the slats are angled like venetian blinds, so you still get light and air, but vision is restricted.

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Have you considered an outdoor stone fireplace?