Custom mount something in there. I've got a SPAL kit for power windows in my Civic and something else for the locks (not sure what brand). There are tons of kits out there in the aftermarket for power locks and windows. You can always fab in a setup from another Civic, but your stock door panels might not have space to fit all the gear. Working inside the door shells to install power window tracks and all that isn't fun either- but it can be done. I would recommand a simple aftermarket kit, but that's me.