To use awesome window manager with KDE Plasma you need to do following
# nano /usr/share/apps/ksmserver/windowmanagers/awesome.desktop
and paste following in that file
[Desktop Entry] Encoding=UTF-8 Name=Awesome Comment=Highly configurable framework window manager Type=XSession Exec=awesome TryExec=awesome
Now go to kde system settings > Applications > Default Applications > Window Manager and select awesome 🙂
Wasn’t this awesome?