Good news!

As of Ubuntu 16.04 and linux kernel 4.5, there is no need to create a custom kernel for the SP3. Most things work right away except for the touch pad that needs to be enabled by editing the following file
sudo nano /usr/share/X11/xorg.conf.d/10-evdev.conf
and adding this to the end

Section "InputClass"  
        Identifier "Surface Pro 3 cover"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "evdev"
        Option "vendor" "045e"
        Option "product" "07dc"
        Option "IgnoreAbsoluteAxes" "True"
EndSection 

I believe that the only thing missing now is multi touch support but I think that is just a small inconvenience