I'm just about to do mine. But instead of doing the whole LED thing I will be using where I can refractor LED replacement Bulbs. There is a company on Ebay called Velocity LEDs that suppy the #194 refractor bulbs, which unlike a standard LED with its limited 20 degree viewing angle, consists of 5 LED's in one bulb pointing in all angles. The other smaller type are #74's which are inverted LEDs, but again fit straight into the bulb holder.
Of course I will still be using LEDs for the heater controls, but it saves having to do the dial cluster, cigarette lighter etc...
I would point out though that these do cost around $9.99 a pair!!! However, the Ebay guy does bulk discount with batches of 10 or more .
Will post the results of the change when I get the bulbs this week.