(little out of order) installed some led puck lights using 1/2" birch to make 4" strips that then were attached to rivenuts in the roof frame. The back 6 are over the truck bed on two separate strips that all are controlled by a switch on the electric panel in the driver's rear wall. Over the cabover sleeping platform, there is one light each side with a dimmer touch switch (all off amazon, can find links if anyone wants). also not pictures is two usb ports for charging phones at night.
Last picture shows the plastic grommets that I used for running wire through the roof frame.
Last picture shows the plastic grommets that I used for running wire through the roof frame.