Here is a view down onto the fenders that are attached to the rear swing arm in the Borealis V3.
The little fender that covers the rear derailleur is still a work in progress. This is about the seventh version but it still needs a bit of refinement as it is not a shape that easy the layup. It prevents water thrown around inside the rear fender from landing on the chain. Tomorrow should see the install of the main rear fender that covers all the these. Once the rear fender is on I will be able to tell how I can improve the rear derailleur cover so we can try out version eight in a couple of weeks.