Front and Rear Map Light Mod

I have been doing much research on how to get more ligt inside the cab when I open the doors. I have found one person that rewired his rear map lights so that they still functioned with the switch but also illuminated when the doors opened. http://rrsport.co.uk/forum/topic5550.html

So I am considering attempting this mod with the use of diodes to prevent all interior lights from coming on if/when someone switches on the rear map lights. In addition, I am thinking this mod would work for the front two map lights on the sides of the center light that comes on with the doors and be even easier since the power feed would be the one that powers the center light so no long wire runs. This way all five ceiling lights would come on with the opening of a door. To top it off I plan to replace the bulbs with LEDs. After all of this I am thinking I would have sufficient lighting.

Has anyone else done this mod? Or is there a better way?