Go for it, I'll be interested in seeing how it turns out. Just so you know, alot of vehicles get confusted with LED bulbs because they draw so little power - the car thinks there's a bulb that isn't working.
If this is the case, there's something that you'll want to put inline with the bulb so the car can recognize there's a bulb there. Not sure our Jeeps act like this, but if you get a problem where they blink really fast, this is what you need to do.
I've been looking into moding a series of led bulbs into the stock housing... I'll prolly do this once I'm not so busy with school.
When you get this going, be sure to post picts.