Some more pictures.
Its not the tidiest job, could look a lot neater.
I am also tempted to make the arrays a bit more rugged by masking off the actual LEDs with some tape strips on the front, removing the double-sided tape from the back and then liberally spraying them front and back with some clear epoxy. To keep out moisture and dust from the arrays.
They will probably need to be unglue'ed now and again to brush out dust. I dont find these lights very dust proof.
Note to be careful when removing the glass from the bulbs, prior to soldering some wires where thbe filaments were. I just crushed them with some big pliers in a bag to catch all the glass. Meybe someone makes bayonet connectors without having to do this. I dont know.
Here are the parts with the eBay descriptions. All prices $AU (slightly more than $US)
Red LED array:
$2.40 each "Red Car Interior Light Panel 48 LED SMD + T10 Dome BA9s Adapters"
White LED array:
$5.98 each "White 1210 SMD 48 LED Car Interior Dome Light Panel w T10 BA9S Adapter"
Yellow/orange LED array:
$6.70 each "Yellow 1210 3528 SMD 48 LED Dome Light Lamp w T10"
$1.18 "3w Watt 24 Ohm 24 R Metal Film Resistor (10 Pcs)"
$3.00 "1N4004 Rectifier Diode 1A 400V DO41 (25 Pack)"
Not a hard job at all, just need a soldering iron, some heat shrink tubing and a hot melt glue gun.