My outdoors layout is almost as sheltered as an indoor layout. Garden Railway? - No! It is an along-the-wall railway from a former wood storage area (4ft deep) to a below deck area (roughly 11ft square). Those given sheltered areas set the maximum for radii. (Images 1, 2, 4)
In former firewood storage area LGB R1, other areas wherever possible larger.
Last fall I took down the along-the-wall parts (straight and perhaps a bit boring. I want to rebuild as soon as temperatures are friendly enough (the Kootenays, W. Canada) with wide curves. I had a temporary 'study area' for this experimenting with plastic waste pipe pieces as supports. Looked a bit wind-blown

And then came winter. (Images 3, 5)
When rebuilding I will use a conventional grid support. (Image 6)
Also, I will rebuild before my brown-coat helper emerges from winter denning. (Image 7)
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...oh, and, (3rd edit, spell before) - I run mostly BP/RC. There is but one area outside where I need to take care of polarity. A bit of grease for the track connectors helps a lot. Not converted engines manage complete runs without issue.