The roof (not yet painted) now has lights; three 5 watt mr16 spotlights and about 250 white leds on a tape strip.

I 3d printed a bracket for the mr16 (design and stl files available in the file section here) and fastened a mr16 socket to this.

I inserted a light and extended the cables.

I added the tape strip of led lights and used velcro to hold my mr16 brackets. My 3d printed mr16 brackets have "wings" that can be drilled through to secure the bracket to the roof--but I want to be positive of the placement (and have the roof painted) before I do that.