Patrick,
Been following your trunk mounted LED experiment, have a suggestion for assembly.
That is to drill the holes in the housing with a center to center distance slightly further apart than the width of one LED. Once the holes are all done, then install the LEDs one at a time, this might be easier in the long run, than trying to line up a pre glued block of LEDs with the holes. Then wire it up and if it works and looks good, pot the whole thing with silicone glue or hot melt glue.
If you have access to a mill, that would make getting the holes accurately placed a lot easier and it would look better too if the spacing and alignment was right on.
Not that you can't achieve excellent results with a punch, drill and a steady hand.
Will be interested to see how it looks!
