Install the gutter and run your 1 5 downspout with 90 degree or 45 degree depending on your configuration.
How to make pvc gutters.
In my wife s village near madang papua new guinea they always use pvc pipe for guttering on corrugated iron roofs.
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They cut a narrow slit along the length of the pipe just wide enough for the corrugations to fit inside the pipe.
A downspout would be very simple to make as well just simply glue in two end caps and a 3 x3 x1 5 tee to your 3 pvc pipe.
The narrow strip is then cut into lengths and used to strap the gutter in position.