You might be able to do away with gutters if your area is not subject to high rainfall and flooding.
How to make gutters from pvc pipe.
Pvc pipe that is 4 inches or more in diameter can be split lengthwise and used as a simple.
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In place of.
Homemade alternative for gutters pvc gutter replacement.
Then cut the top 1 3 to 1 2 of top of the pipe off.
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.
Install the gutter and run your 1 5 downspout with 90 degree or 45 degree depending on your configuration.