I like you plans, I would imagine it wouldn't be that difficult, few holes drilled here, a few leds popped through there, then just wire it to the interior light 
cheers mate, my only fear is getting LED feaver and turning my car into a festive wonder

plans are for exterior handles to light up when remote locking; on for unlocked and when the key is pulled out of the ignition as well as soft red glow on interior door handle and maybe a footwell glow as well? however my courtesy lights are all going to be brilliant white so still in two minds with the red or if i should just plug them into the mains so that when side or full beam is on then the door handles on the interior are illuminated?
so many choices!!
