So two things. One is you should use the new renderer infrastructure if you want to implement a DX11 renderer. The branch that is now the main development branch for that is "goodbye_cmake".
As you can tell by the name, this branch is also restructuring the entire Polycode repo to make it easier to work with across platforms and getting rid of CMake altogether.
The other thing is that I am writing a DX12 renderer for the new UWP core that's going to be part of the new rewrite, though that will likely stay UWP-only! It would be nice to have a general DX11 renderer for win32 apps as well!